How Do Drug Prices Respond to a Change from
Evidence from a Danish Regulatory Reform∗
Reference pricing is a widely used cost containment tool where the maximum reimburse-
ment obtained by a patient is determined by the government using prices of similar drugs asa reference. We study the eﬀect of a change in the design of reference price systems using aDanish regulatory reform. In 2005 the country switched from external to internal referencepricing. Previous to 2005, the reference price was calculated using average prices in otherEuropean countries. After the reform, the reference price is deﬁned by the cheapest availableproduct in the country. We investigate the eﬀects of the reform on three therapeutic markets:For the treatment of a chronic condition we use anti-cholesterol drugs, for a semi-chronic con-dition we use antiulcerants, and for the treatment of an acute condition we use antibiotics. Weﬁnd that the switch from external to internal reference pricing led to a substantial reductionin pharmacy purchase prices. The eﬀects are stronger for chronic conditions than for acuteconditions. Furthermore, the reform aﬀects generics and parallel imports more than originalproducts. Finally, we ﬁnd that the reform reinforces the eﬀects of competition.
pharmaceutical markets, regulation, reference pricing.JEL Classiﬁcation:
We are greatly indebted to Hannes Ullrich. Financial support from the Swiss National Science Foundation
(grants 100018-135257 and PBZHP1-143346) and the Economic Policy Research Network is gratefully acknowledged.
University of Zurich, Department of Business Administration, Plattenstr. 14, 8032 Zurich, Switzerland, ul-
; Copenhagen Business School, Centre for European Economic Research, Mannheim,and Institute for the Study of Labor, Bonn
University of Zurich, Department of Business Administration, Plattenstr. 14, 8032 Zurich, Switzerland, su-
Reference pricing systems, where patients are reimbursed a fraction of the retail price when buying
a prescription drug, constitute a particularly widely embraced tool to curb medical expenses across
the world (Berndt and Dubois 2012; Esp´ın et al. 2011; L´
opez-Casasnovas and Puig-Junoy 2000).
These systems aim at beneﬁting patients that prefer cheaper products over more expensive ones,
thus inducing more price sensitivity on consumers and more competitive pressure on ﬁrms.
There exists a large body of empirical evidence that shows that such systems indeed are
eﬀective in bringing down retail prices of prescription drugs (Aronsson et al. 2001; Brekke et
al. 2007, 2009, 2011; Danzon and Liu 1998; Kanavos et al. 2008; Pavcnik 2002; Puig-Junoy
2007). It is also observed that diﬀerent countries apply diﬀerent rules as to how the reference
price is determined. However, much less is known about the consequences of the design
reference price systems. In April 2005, Denmark switched from external reference pricing (where
the reference price was calculated as the average price of similar products in other European
countries) to internal reference pricing (where the reference price is calculated as the cheapest
price of a similar product in the country). A switch from an external to an internal reference
price system creates incentives for patients to buy the cheapest product within a set of substitutes,
since the price wedge between the cheapest substitute and a preferred products becomes larger
due to the reform, unless there is only a single product in a group of substitutes. This argument is
theoretically formalized by Brekke et al. (2009, 2011). We empirically study the eﬀects on prices
of a change in the design
of the reference price system using a comprehensive panel set that covers
around 23,600 observations of 640 unique products that we track for 59 fortnightly time periods.
We speculate that the eﬀect of the reform on prices varies by the severity of the condition
and by the type of the ﬁrm. Speciﬁcally, we distinguish between drugs that treat a chronic
disease, a semi-chronic disease, and an acute disease. For the chronic condition we use anti-
cholesterol drugs (statins). For the semi-chronic condition we use drugs for peptic ulcer and
gastro-oesophageal reﬂux disease (antiulcerants). And for the acute condition we use antibiotics.
Our prior is that patients with a chronic condition are more price sensitive than patients for an
acute condition because health expenditures are generally substantially higher, treatment time
is longer and patients might be more experienced and better informed about their substitution
In addition, we diﬀerentiate between three types of ﬁrms: original ﬁrms, generic ﬁrms and
parallel importers. Original ﬁrms engage in R&D using intellectual property rights to protect
their innovations. Generic ﬁrms produce drugs that are bioequivalent copies of original products
and may only legally enter the market after the patents have expired. Parallel importers do not
engage in manufacturing. Instead, they buy products in low-price countries, repackage, relabel,
and sell them in high-price countries. Parallel importing is legal within the European Union and
in Denmark it is permitted for both on-patent and oﬀ-patent pharmaceuticals. We explicitly allow
the reform to aﬀect each type of ﬁrm diﬀerently to account for the evidence supported by a large
body of literature suggesting that generics are perceived to be diﬀerent from original products.
Previous studies ﬁnd that original ﬁrms keep high prices and are able to retain substantial market
shares despite the presence of low-price generic substitutes. This is associated with consumers
heterogeneity with respect to their price sensitivity and consumers brand-loyalty generated by
ﬁrst-mover advantage (Caves et al. 1991; Grabowski and Vernon 1992; Frank and Salkever 1997;
Aronsson et al. 2001; Coscelli 2000).
Speciﬁcally, after generics enter the market, the price
sensitive consumers switch and original producers are left with consumers that are even less price
sensitive and probably brand-loyal. We expect that the switch from external to internal reference
pricing aﬀects generics more than original products, because these are consumed by more price
sensitive patients. In addition, parallel imports are closer substitutes to original ﬁrms because
they are not copies but exactly the same product in another package. Therefore, we expect parallel
importers to react similarly to original ﬁrms.
Our paper is most closely related to the seminal work of Pavcnik (2002). She studies a switch
from price cap to external reference pricing in Germany, one of the countries that ﬁrst introduced
this policy. She uses reduced-form pricing regressions where she maps dummy variables for the
time period after the regulatory change to retail prices. The ﬁndings suggest that producers
substantially reduced prices after the reform. In particular, she ﬁnds that the eﬀects are stronger
for original products, specially for those that faced generic competition. We also explore the latter
ﬁnding and control for competition. We expect the reform to reinforce the eﬀects of competition,
such that prices decrease more in markets facing more competitors after the reform is introduced.
Other related work includes Brekke et al. (2009, 2011) and Kaiser et al. (2013). The ﬁrst group
of papers studies a switch from price cap to reference price regulation in Norway, conﬁrming the
previous results. In Kaiser et al. (2013) we conduct a welfare analysis of the Danish change from
external to internal reference pricing. This analysis focuses on anti-cholesterol products only and
it also includes reduced–form pricing equations similar to Pavcnik. The main ﬁnding is that the
substitution from external to internal reference pricing yield a substantial decrease in prices, but
opposite to Pavcnik, the eﬀects are stronger for generics. The present analysis extends our earlier
analysis by including treatments for a semi-chronic and an acute condition.
In our paper we ﬁnd that the switch from external to internal reference pricing has eﬀectively
impacted pharmacy purchase prices negatively, more so for chronic conditions than for acute
conditions. We also show that the reform aﬀected prices for generics and parallel imports more
than for original products. Finally, competition plays an important role and we show that the
change in the design of reference pricing reinforced the eﬀects of competition in reducing prices,
inducing strongest price changes for markets with many substitute products.
This paper is organized as follows. Section 2 oﬀers an overview of the Danish pharmaceutical
market. Section 3 describes the data. Section 4 describes the empirical framework. Section 5
presents the results. Section 6 concludes.
This section oﬀers a short overview of the Danish pharmaceutical industry and describes the main
regulatory framework. In Denmark the pricing of pharmaceutical products is free in the sense
that ﬁrms can set any price. However these prices must be reported to the Danish Medicines
DKMA makes them publicly available online under URL
, a website that also contains information on all authorized pharmaceuti-
cal products in Denmark and was designed to ensure that prices for pharmaceuticals are identical
Second, pharmacies operate in a highly regulated environment. The number and location of
pharmacies, as well as their markups are regulated by the government. The regulation of the
markup implicitly sets the pharmacy retail price pc
, such that pc
, where pf
is the price
set by the ﬁrm (pharmacy purchase price) and k
is the prescription fee (including value added
taxes (VAT)). Moreover, Danish pharmacists are required to dispense the cheapest product among
available substitutes, unless the consumer or the doctor explicitly requests another product.
Third, consumers are entitled to free and equal access to health care services. The reimburse-
ment that consumers obtain when buying pharmaceuticals depends on her annual health care
expenditures and the choice of the product. The ﬁnal price paid by consumers pcop
is given by:
denotes the pharmacy retail price., pr
is the reference price and τ
is the fraction of the
reference price that will be reimbursed. Consumers in long term treatments with high prices can
obtain as much as 80 percent of their cost reimbursed.
The reform aﬀecting reference prices took eﬀect on April 1, 2005. Denmark changed from
external to internal reference pricing for all prescription-only pharmaceuticals independent of
No other changes were made to the reimbursement system.
reform, the reference price for a given product was deﬁned as the pharmacy retail price of the
chosen product up to the average price of the same product in the EU-15 member states, excluding
Greece, Luxembourg, Spain, and Portugal. Once the retail price exceeded the EU average price,
the reference price was set equal to the EU average price.
The reimbursement reform originated from an assembly of a group of experts from the Danish
Ministry of Health on September 15, 2003, who wanted to collect ideas for a reform of the existing
reimbursement system to strengthen competition and cost awareness. The Danish Association of
the Pharmaceutical Industry (Lægemiddel Industri Foreningen, LIF) — the Danish assembly of
original drugs producers — launched the idea of using the domestic Danish price of the cheapest
available product within a substitution group as the reference price instead of EU averages. In
June 2004, the Danish parliament ratiﬁed the new reimbursement law making it public and
These government–determined dates are important for our analysis as they deﬁne the time
periods before and after the reform. Other events that may have aﬀected drug prices include a
voluntarily agreement on price ceilings that was established by LIF members between May 2001
and April 2003 and a new agreement on price ceilings that the Danish Ministry of Health and
LIF ratiﬁed in October 2006. The voluntary price ceilings agreement was not respected by most
LIF members, and probably neither by generic ﬁrms or parallel importers, since they are not
In order to separate the reform eﬀects from the price ceiling agreements before and after
the reform, we deﬁne and focus our analysis to a base period
and an implementation period
The base period includes the time between September 15, 2003 and June 7, 2004 — the time
between the working group assembly and the ratiﬁcation of the reform in parliament. We choose
these dates because, during that time, no reliable information about prospective changes in the
reimbursement system was publicly or privately available. Moreover, the number of ﬁrms as well
as prices remained stable, an issue that we discuss in more detail in Section 3. The implementation
period covers the time between April 1, 2005 and September 25, 2006, the time span between
the reform implementation and the beginning of the new price ceiling agreement. We discard all
other time periods for our empirical analysis.
Our data set contains fortnightly prices and other characteristics of pharmaceuticals in three
therapeutic markets: Anti-cholesterol drugs, drugs for acid-related gastrointestinal conditions,
and antibiotics. These products are used in the treatment of diseases that vary in their severity
and length of therapy with anti-cholesterol drugs constituting the longest and with more severe
consequences and antibiotics constituting the shortest and least severe therapy.
We diﬀerentiate these markets because we expect the reform to have diﬀerent eﬀects in each
one. Our prior is that patients with a chronic condition are more price sensitive than patients in
an acute treatment, due to the fact that their health care expenditures are generally substantially
higher, treatment time is longer and they might be more experienced and better informed about
A product is deﬁned by four attributes: active substance, strength, package size, and ﬁrm.
The active substance is captured by the 5-level anatomical therapeutic chemical classiﬁcation
code (ATC Code). Strength measures the amount of the active substance in milligram per pill.
Package size is the number of pills per package. Importantly, products with similar ATC codes
are closer substitutes than products with in other ATC codes. DKMA classiﬁes products with the
same 5-level ATC code, strength, administration form, and similar package size into substitution
groups. Products within a substitution group are perfect substitutes and consumers can freely
choose among products in the same substitution group.
To make products from diﬀerent strength or package size comparable we normalize prices
and quantities using deﬁned daily doses (DDD). This measure is proposed by the World Health
Organization and widely used in the pharmaceutical industry. One DDD is deﬁned as the average
maintenance dose per day for a drug used for its main indication in adults.
Our dependent variable is the pharmacy purchase price in Danish krones (DKK) per deﬁned
daily dose (DDD), i.e. the price that is actually set by the producers for a unit of DDD. Prices
are deﬂated using the consumer price index with the year 2005 as basis.
Table 1 provides information on turnover, reimbursement, the number of patients in treatment
and sales for each therapeutic group. This information is not based on the product-level data
that we use in our econometric analysis but was downloaded from www.medstat.dk
, a website that
contains yearly statistics on consumption and utilization of pharmaceuticals in Denmark. The
table shows that turnover (pharmacy retail price ×
DDDs sold) is relatively similar to all products
but slightly higher for antiulcerants. However, the chronic conditions account for a higher share
of reimbursement than the acute condition. Moreover, the number of patients diﬀers enormously
between the treatments. In 2005 almost 1.7 million patients were treated with antibiotics. In
the same year the number of patient treated with antiulcerants was around 380,000 and 307,000
patients were treated with anti-cholesterol drugs. The increase in the number of patient using
anti-cholesterol drugs is remarkable (170 percent from 2002 to 2006). Utilization per patient (sales
in DDD relative to number of patients) is much higher for anti-ulcerant and anti-cholesterol drugs
Finally, Table 1 also gives an estimate of the duration of treatment indicated by the measure
at the bottom of the table. If we convert it into sales in DDD per inhabitant per year, the
measure constitutes an estimate of the number of days for which each resident is annually treated
on average. If each person in Denmark were treated with anti-cholesterol drugs, the treatment
length in 2006 would be around 22 days. The treatment for antiulcerants would be between
11 and 14 days, and the treatment with antibiotics would only take ﬁve days. These ﬁgures
are approximations and are just meant to illustrate diﬀerences in treatment durations. Actual
treatment with anti-cholesterol drugs can be lifelong, while a treatment with antiulcerants lasts
Our data is consists of information on 253 antiulcerants, 228 statins, and 157 antibiotics that
we observe for 58 fortnightly time periods.1 Table 2 displays descriptive statistics on prices and
variables that mirror the respective competitive situation. Reported are fortnightly average prices
for a DDD in DKK. A DDD of antibiotics costs on average more than a DDD of anti-cholesterol
products or antiulcerants. Note that average reference prices are higher than average pharmacy
purchase prices, because the latter do not include prescription fees or VAT.
Furthermore, the average number of products and average number of ﬁrms is relatively stable
and very similar for all groups, which helps us mitigate attributing eﬀects to the reform that could
have arisen from entry and exit. In contrast, the average number of substitution groups and the
average number of products in a substitution group diﬀers signiﬁcantly. For anti-cholesterol drugs
there are on average 40 substitution groups, each with around ﬁve to seven products to choose
from. In the case of anti-ulcerants there are only around three products in each substitution
group, and in the antibiotics group, there are only two products in each substitution group. We
expect the reform to have stronger eﬀects on the chronic condition, since this is the therapy that
Finally, the table presents the share of original products, generic products, and parallel imports
1Appendix A displays the exact classiﬁcation of the products in terms of their ATC code.
in each group. The share of generics in the chronic and semi-chronic condition is higher than the
share of original products. Parallel imports are also well represented in these groups (28 percent of
anti-cholesterol drugs and 12 percent of antiulcerants) but not in the group of antibiotics, where
they only make one percent of all observations. Antibiotics is a group dominated by original
This section describes our empirical framework. Our aim is to identify the eﬀect of the reimburse-
ment reform on pharmacy purchase prices. To this end, and like Pavcnik (2002), we estimate
standard ﬁxed eﬀects regressions of dummy variables for the reform and variables that represent
competition on the natural logarithm of pharmacy purchase prices. Our regression equation take
1R ∗ dop
2R ∗ dpi
2R ∗ zj
1R ∗ zj ∗ dop
2R ∗ zj ∗ dpi
is the pharmacy purchase price of a product j
in time t
denotes a dummy variable
that is coded one for the implementation and zero for the base period. It is our variable of main
interest and its corresponding parameter ρ
is to be interpreted as the approximate percentage
diﬀerence between the pharmacy purchase price before and after the reform. dop
dummy variables equal to one if the product is an original product (op) or if the product is a
parallel import (pi) respectively. We interact these dummy variables with the reform dummy to
allow for diﬀerent impacts in diﬀerent types of ﬁrms. The variable zj
is the number of products in
a substitution group and measures the the current competitive situation of product j
. We interact
with the reform dummy to allow competition to have diﬀerent eﬀects on prices before and after
the reform and in addition, we permit these eﬀects to diﬀer for each ﬁrm type by interacting
them with the ﬁrm type dummy variables. The term µj
lumps together all product-speciﬁc time-
invariant characteristics of product j
. Since all drug characteristics — strength, active ingredient,
package size and substitution group — are time-invariant, we do not need to additionally account
for them. Finally, we include a full set of time dummy variable νt
and the term ϵjt
is an iid
This section reports our empirical ﬁndings from a change in the design of reference pricing. The
results are summarized separately for each therapeutic treatment. Table 3 presents the results for
anti-cholesterol drugs, Table 4 the results for antiulcerants, and Table 5 the results for antibiotics.
Empirical Finding 1 (Price Eﬀect) A switch from external to internal reference pricing yields
a substantial reduction in pharmacy purchase prices. The eﬀects are stronger for chronic condi-
Importantly, the eﬀects of the reform are stronger the more severe the condition is. We ﬁnd
that prices decrease by 47 percent (= exp(−
1) for statins, by 22.9 percent for anti-
ulcerants and 5.3 percent for antibiotics. These are the results from a speciﬁcation that includes
only a dummy variable for the reform and product-speciﬁc ﬁxed eﬀects (see Speciﬁcation (1) in
all tables). This pattern is robust to the inclusion of more explanatory variables. These results
support the view that consumers with a chronic condition are more price sensitive than those
with an acute condition and as expected, the reaction to the reform in chronic groups is stronger.
We additionally study diﬀerences in reform eﬀects for each type of ﬁrm. In Speciﬁcation (2)
we introduce two variables that measure the eﬀect of the reform on original products and the
eﬀect of the reform on parallel imports. Generics constitute the base category and the coeﬃcient
on the reform dummy corresponds to the reform eﬀect on generics.
Empirical Finding 2 (Eﬀects by Type of Firm) A switch from external to internal refer-
ence pricing aﬀects generic ﬁrms and parallel importers stronger than original ﬁrms.
The eﬀects on generics and parallel imports is stronger than for original products in all ther-
apeutic groups. Specially in the group of statins, where the negative eﬀect on original products
(-0.23 = exp(−
1) is substantially lower than the eﬀects on generics (-59.6 percent)
or parallel imports (-60 percent). Furthermore, in all therapeutic groups, the diﬀerences in eﬀects
between generics and parallel imports are small and not statistically signiﬁcant. Contrary to our
ﬁndings, Pavcnik (2002), Granlund (2010), and Brekke et al. (2011) ﬁnd stronger price decreases
for original products. However, these studies analyze the introduction of reference pricing, while
in our setting, a policy of reference pricing was already in place and we expect patients to be
Next, we use the number of products in a substitution group as a measure for competitiveness
and allow it to aﬀect prices diﬀerently before and after the reform.
Empirical Finding 3 (Eﬀects of competition) A switch from external to internal reference
pricing reinforces the eﬀects of competition. Specially for generic products and chronic conditions.
The results correspond to Speciﬁcation (3) and indicate that it is ambiguous how more prod-
ucts in a substitution group aﬀect prices. The eﬀects for statins is almost zero, for antiulcerants is
negative, while the eﬀect for antibiotics is positive. However, we show that the reform reinforces
the expected eﬀect of competition and this result is consistent in all three markets. The coeﬃcient
of Reform × # of products in substitution group
is negative and signiﬁcant for all therapeutic
groups, suggesting that more competition after the reform is associated with lower prices. This
result also holds if we further allow the reform eﬀects to be diﬀerent for products from diﬀerent
types of ﬁrms (Speciﬁcation (4)). These ﬁndings reﬂect the diﬀerences in the structure of the
therapeutical markets. Products in the same substitution group are closer substitutes to each
other, than products outside the substitution group. While for antibiotics there are many substi-
tution groups each with few products, the structure for statins is the opposite: few substitution
groups each with more products (as reported in Table 2). The reform reinforces the eﬀects of
competition more for chronic conditions, where there are many substitution options, than for
acute conditions, where there are fewer substitution options. Furthermore, in Speciﬁcation (5)
we allow competition to have a diﬀerent eﬀect, not only before and after the reform, but also
for diﬀerent types of ﬁrms. The results suggest that the reform reinforces competition eﬀects
To summarize our results, we ﬁnd that the switch from external to internal reference pricing
has eﬀectively impacted pharmacy purchase prices negatively, mostly so for chronic conditions
than for acute conditions. We also show that the reform aﬀected prices for generics and parallel
imports more than for original products. Finally, competition plays an important role and we
show that the change in the design of reference pricing reinforced competitive pressure, inducing
strongest price changes for markets with many substitute products.
While it is undisputed that reference pricing eﬀectively brings down prices of pharmaceutical
products, much less is known how a reference price system should ideally be designed. We focus our
analysis with one particularly design question: should reference prices be externally determined
2Appendix B presents the results from speciﬁcation (5) separately for each type of ﬁrm, in each therapeutic
or internally determined? To provide an answer, we use a Danish reform for reimbursement of
expenditures for pharmaceuticals. Where Denmark switched from external to internal reference
As Pavcnik (2002) we estimate reduced-form pricing equations where we linked the reform to
pharmaceutical purchase prices for three types of therapeutic groups that diﬀer in the severity
of the condition: anti-cholesterol drugs, that treat a chronic condition, antiulcerants, that treat
a semi-chronic condition, and antibiotics for the treatment of an acute condition. We allow for
diﬀerent eﬀects in these groups because consumers diﬀer in their price sensitivity by the type of
condition. Consumers with a more prevalent disease face regular and higher expenditures, thus we
expect them to be better informed with regard to their substitution alternatives, than consumers
that are treated occasionally and for a short period of time, as is usually the case of antibiotics.
We ﬁnd that the switch from external to internal reference prices substantially reduced phar-
macy purchase prices. The eﬀects are stronger for chronic conditions and for generics products
and parallel imports. Furthermore, the reform reinforces the eﬀects of competition.
Table 2: Summary statistics
Notes: Table 2 reports summary statistics for all variables in each therapeutic group. Prices are fortnightly averages fora deﬁned daily dose in Danish krones. All ﬁgures deﬂated using consumer prices index with June 2005 as basis.DDD
Table 3: Estimation Results – Anti-Cholesterol
# Products in subs. group
# Products in subs. group ×
# Products in subs. group ×
Notes: Table 3 reports linear regression estimates of the coeﬃcients in our pricing equation for the therapeuticmarket of anti-cholesterol products. The variable PI
stands for parallel import, the variable Original
standsfor original product. Robust standard errors in parentheses. The estimation sample contains only the baseand the implementation period. Statistical signiﬁcance: *** p <
01, ** p <
05, * p <
Table 4: Estimation Results – Antiulcerants
# Products in subs. group
# Products in subs. group ×
# Products in subs. group ×
Notes: Table 4 reports linear regression estimates of the coeﬃcients in our pricing equation for the therapeuticmarket for antiulcerants. PI stands for parallel import, Original stands for original products. Robust stan-dard errors in parentheses. The estimation sample contains only the base and the implementation period.
Statistical signiﬁcance: *** p <
01, ** p <
05, * p <
Table 5: Estimation Results – Antibiotics
# Products in subs. group
# Products in subs. group ×
# Products in subs. group ×
Notes: Table 5 reports linear regression estimates of the coeﬃcients in our pricing equation for the therapeuticmarket for antibiotics. PI stands for parallel import, Original stands for original products. Robust standarderrors in parentheses. The estimation sample contains only the base and the implementation period. Statisti-cal signiﬁcance: *** p <
01, ** p <
05, * p <
Characterization of Products in Terms of Their ATC Code
Notes: Appendix A displays a detailed classiﬁcation of the products considered in the analysis in termsof their Anatomical Therapeutical Chemical classiﬁcation code and the average number of products for aperiod of 14-days in each molecule group for the base and the implementation period. Source for classiﬁ-cation: WHO Collaborating Centre for Drug Statistics Methodology.
Estimation Results by Product Type
Notes: Table B reports linear regression estimates of the coeﬃ-cients in our pricing equation and summarizes the results by thetherapeutic market. Robust standard errors in parentheses. Theestimation sample contains only the base and the implementa-tion period. Statistical signiﬁcance: *** p <
01, ** p <
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Herb-Drug Interactions Herbs with higher risk of adverse reactions John K. Chen, Ph.D., Pharm., O.M.D., L.Ac. Evergreen Herbs and Medical Supplies, LLC17431 East Gale Ave. City of Industry, CA 91748Copyright 2004. Chen and Chen. Chinese Medical Herbology and Pharmacology. Page: 25-30Copyright 2004. Chen and Chen. Chinese Medical Herbology and Pharmacology. Page: 25-30C