Drug safety of rosiglitazone and pioglitazone in France: a study using the French PharmacoVigilance database
© Berthet et al; licensee BioMed Central Ltd. 2011
Received: 7 September 2010
Accepted: 24 May 2011
Published: 24 May 2011
Thiazolidinediones (TZDs), rosiglitazone (RGZ) and pioglitazone (PGZ) are widely used as hypoglycemic drugs in patients with type 2 diabetes mellitus. The aim of our study was to investigate the profile of adverse drug reactions (ADRs) related to TZDs and to investigate potential risk factors of these ADRs.
Type 2 diabetic patients were identified from the French Database of PharmacoVigilance (FPVD) between 2002 and 2006. We investigated ADR related to TZD, focusing on 4 ADR: edema, heart failure, myocardial infarction and hepatitis corresponding to specific WHO-ART terms.
Among a total of 99,284 adult patients in the FPVD, 2295 reports concerned type 2 diabetic patients (2.3% of the whole database), with 161 (7%) exposed to TZDs. The frequency of edema and cardiac failure was significantly higher with TZDs than in other patients (18% and 7.4% versus 0.8% and 0.1% respectively, p < 0.001) whereas the frequency of hepatitis was similar (5.9% versus 4%, NS). A multiple logistic regression model taking into account potential confounding factors (age, gender, drug exposure and co-morbidities) found that TZD exposure remained associated with heart failure and edema, but not with hepatitis or myocardial infarction.
Thiazolidinediones exposure is associated with an increased risk of edema and heart failure in patients with type 2 diabetes even when recommendations for use are respected. In contrast, the risk of hepatic reactions and myocardial infarction with this class of drugs seems to be similar to other hypoglycemic agents.
Thiazolidinediones (TZDs) are peroxisome proliferator-activated receptor (PPAR) agonists which regulate transcription of genes encoding proteins involved in glucose and lipid metabolism. Troglitazone, the first agent of this class, caused serious liver toxicity leading to its withdrawal in 2000, less than 3 years after its marketing . The use of the 2 other TZDs, rosiglitazone (RGZ) and pioglitazone (PGZ), has sharply increased during the last few years. These 2 drugs seem to present a lower risk of hepatotoxicity than troglitazone .
TZDs could also induce adverse drug reactions (ADRs) related to the cardiovascular system including edema and heart failure [3, 4]. Edema is more frequent when the TZD is used in combination therapy and its incidence is higher in association with insulin. . Because of the risk of congestive heart failure , the use of RGZ and PGZ was initially contraindicated in France in patients with a cardiac insufficiency corresponding to classes I to IV of the NYHA classification. The European Medicines Agency recommended the suspension of marketing authorizations for rosiglitazone-containing anti-diabetes medicines in Europe in September 2010 . This decision followed the publication of 2 studies finding an increased cardiovascular risk of rosiglitazone [7, 8]. In view of the restrictions already in place on the use of rosiglitazone in Europe, no additional measures have been identified that could reduce this cardiovascular risk.
The aim of our study was to investigate the profile of adverse drug reactions (ADRs) related to TZDs as reported to the French PharmacoVigilance System in type 2 diabetic patients, with a special focus on congestive heart failure and myocardial infarction, and to investigate factors associated with these ADRs.
We used the data from the French national system of PharmacoVigilance, which has been described before [9, 10]. All suspected ADRs are evaluated using a French standardized scale of causality assessment and registered in the French PharmacoVigilance Database (FPVD) . For each report, information on patient's data (age, gender, medical history) and drug exposure (suspected and concomitantly used drugs) is recorded along with a brief clinical description. ADRs are coded according to ADR Terminology of the World Health Organization (WHO-ART) .
RGZ was the first TZD marketed at the end of 2001 in France. Therefore we performed searches in the French PharmacoVigilance Database for ADRs reported from January 2002 to December 2006. Among all cases of ADRs reported in the database, patients exposed to drugs approved in the treatment of diabetes in France were short-listed, and we selected only patients with type 2 diabetes. The following data were collected: age, gender, medical history (coded ICD 10th), and all drugs (coded according to the ATC classification) used, whether or not they were related to the present ADR. Several co morbidities were identified from medical history and use of drugs. The ADR were described according to the WHO-ART classification and presented as SOC terms. Several WHO-ART codes were retained to specifically describe edema (SOC term cardiovascular disorders and metabolic and nutritional disorders: edema, peripheral edema, low limbs edema), heart failure (SOC term cardiovascular disorders: cardiac failure, congestive cardiac failure, pulmonary edema), myocardial infarction (SOC term cardiovascular disorders and myocardia : myocardial infarction, cardiac death), and hepatitis (SOC term Liver and biliary system disorders: abnormal hepatic functions, abnormal ASAT-ALAT values, hepatitis).
The demographic and clinical characteristics of diabetic patients exposed and non-exposed to TZDs were compared using the χ 2 test or Fisher's exact test for qualitative variables and using the Student's t-test for quantitative variables. In a further step, association between use of TZDs and occurrence of edema, hepatitis, cardiac failure or myocardial infarction was examined in a bivariate analysis. In order to take into account potential confounding factors (age, gender, cardiovascular co-morbidities and other drugs), a multivariate analysis was performed using a backward logistic regression model. The Hosmer and Lemeshow procedure  was used to check the good fitting of the models. All analyses were done with the SAS® software version 9.1.
Demographic and clinical characteristics of patients identified in the French PharmacoVigilance Database with type 2 diabetes.
Total population N = 2295 (%)
TZD exposed N = 161 (%)
TZD not exposed N = 2134 (%)
Heart valve disorders
Drugs used for type 2 diabetes
Alpha glucosidase inhibitor
Angiotensin II inhibitors
Central antihypertensive drugs
Steroidal and Non Steroidal Anti-Inflammatory Drugs
Number and percentage of adverse drug reactions reported in the 161 patients exposed to thiazolidinediones in the French PharmacoVigilance database from 2002 to 2006.
System Organ Classification terms
Number of patients (%)
Body as a whole - general disorders 1810
Metabolic and nutritional disorders 0800
Cardiovascular disorders, general 1010; Myo-, endo-, pericardial & valve disorders 1020; Heart rate and rhythm disorders 1030
Skin and appendages disorders 0100
Central & peripheral nervous system disorders 0410
Red blood cell disorders 1210; White cell and reticulo-endotelial system disorders 1220; Platelet, bleeding & clotting disorders 1230
Gastro-intestinal system disorders 0600
Liver and biliary system disorders 0700
Psychiatric disorders 0500
Respiratory system disorders 1100
Urinary system disorders 1300
Vascular (extra-cardiac) disorders 1040
Vision disorders 0431; Hearing and vestibular disorders 0432; Special senses other, disorders 0433
Endocrine disorders 0900
Muscular-skeletal system disorders 0200
Fetal disorders 1500
Total number of adverse drug reactions
When considering specific ADR, heart failure was significantly more frequent in TZD patients (5 exposed to RGZ and 7 exposed to PGZ, 7.45% versus 0.14% in non-exposed patients; p < 0.001), as well as edema (9 exposed to RGZ and 20 to PGZ, 18.01% versus 0.84% in non-exposed patients; p < 0.0001). We did not find any difference for hepatitis (4 patients exposed to RGZ and 4 to PGZ 4.97% versus 5.39% in non-exposed patients) and for myocardial infarction (only 1 case exposed to PGZ 0.62% versus 1.18% in non-exposed patients).
Results of the multiple logistic regression models concerning the association between TZD exposure and 4 ADRs: Heart Failure, Myocardial Infarction, Edema and Hepatitis.
(0.99 - 1.09)
(1.34 - 24.20)
(17.678 - 241.93)
Hosmer and Lemeshow procedure
(0.95 - 1.00)
(0.78 - 3.84)
(0.05 - 3.17)
Heart valve disorders
(2.63 - 255.47)
(0.09 - 1.19)
Hosmer and Lemeshow procedure
(0.58 - 6.17)
(13.50 - 46.63)
(0.20 - 0.87)
Hosmer and Lemeshow procedure
(0.97 - 1.00)
(0.13 - 1.39)
(0.08 - 1.52)
(0.25 - 1.37)
(0.40 - 1.78)
Non Steroidal Anti-Inflammatory Drugs
(1.13 - 3.01)
(0.32 - 1.06)
Angiotensin II inhibitors
(0.35 - 1.32)
Hosmer and Lemeshow procedure
Among this population of diabetic patients registered in the French Pharmacovigilance database due to the occurrence of an adverse drug reaction, seven percent was exposed to TZDs. In these patients, the reactions were less frequently serious than in patients exposed to other antidiabetic agents. TZD exposure is associated with edema and heart failure in patients with type 2 diabetes, but the risk of hepatic reactions or myocardial infarction with this class of drugs is the same with other hypoglycemic agents.
TZDs can potentially lead to the development of congestive heart failure . In clinical trials, the incidence of edema ranged from 2 to 5% in TZD monotherapy, 6 to 8% with metformin or sulfonylurea and 15% in combination with insulin. In our study, edema represented 18% of ADR related to TZD, and concerned mainly patients exposed to PGZ. Fluid retention can occur even at the lowest TZD dose, and diuretics and ACE inhibitors have variable effects on edema caused by TZDs [1, 3].
We found only one case of myocardial infarction in a patient exposed to PGZ, and this event should not be related to this drug. It concerned a 46-year-old man, treated by lamivudine-zidovudine-nevirapine for a HIV infection, and presenting high serum levels of triglycerides 4,57 mmol/l (N< 1,74 mmol/l), cholesterol 8,80 mmol/l (N< 6,56 mmol/l), with a normal value for HDL-cholesterol. He was also treated by glicazide and benfluorex. After one year of treatment with TGZ, he presented a myocardial infarction successfully treated by angioplasty and a drug-eluting stent. The treatment with PGZ was maintained with a favorable evolution. We did not found any other cases with RGZ or PGZ, whereas 26 myocardial infarctions potentially related to drugs were reported in the population of diabetic patients in this study. Two meta-analyses have suggested that RGZ increases the risk of myocardial infarction but did not reach statistical significance for cardiovascular death [14, 15], but the reviews published in 2010 led to the rosiglitazone withdrawal from the European market in September 2010. The final results of the RECORD trial, which compared cardiovascular outcomes in patients with type 2 diabetes treated with RGZ and metformin or sulfonylurea, confirm the increasing risk of heart failure with RGZ, but do not identify any statistically significant differences in the overall risk of cardiovascular morbidity or mortality . Lincoff's meta-analysis on the effect of PGZ on ischemic cardiovascular events found that PGZ is associated with a significantly lower risk of death, myocardial infarction, or stroke . In their review of the literature in order to estimate the association between hypoglycemic agents and morbidity and mortality in patients with heart failure and diabetes, Eurich et al  concluded that metformin is the only hypoglycemic agent not associated with harm in patients with heart failure. A nested case-control study in older patients found that both PGZ and RGZ were associated with an increased risk of congestive heart failure, acute myocardial infarction, and mortality when compared to other combinations of oral hypoglycemic agents .
Cases of hepatotoxicity with second generation TZDs have been few in number and less severe when compared to troglitazone [2, 20]. Troglitazone, unlike PGZ and RGZ, induces the cytochrome P450 isoform 3A4, which is partly responsible for its metabolism, and may be prone to drug interactions. Floyd et al examined reports of liver failure reported to the FDA during 10 years and estimated that the rate of acute liver failure observed with RGZ or PGZ was about 17 times higher than the background rate for idiopathic acute liver failure in the general population . By contrast, in our study, we did not find any association between hepatitis and TZD in comparison with other drugs used for diabetes. Even if no reliable estimates of the background rate of liver failure in diabetic patients are available in the literature, some have postulated that liver disease may be more frequent in this population with obesity and insulin resistance, due to non-alcoholic steato-hepatitis . Moreover, this population may be exposed to other drugs, some of which are suspected to increase the risk of hepatic injuries , as observed in our data with NSAID.
Some limitations of our study should be discussed. First, limitations are due to the spontaneous reporting system itself, although the reporting rate in France is one of the highest among the European countries [23, 24]. Given the small number of patients treated by TZDs in France, the number of ADR reports with TZD is relatively low, in comparison with the results obtained through the Health Canada's spontaneous adverse event reporting system (195 ADR with pioglitazone and 830 with rosiglitazone up to September 2006) . Underreporting can affect validity of results since it can be related either to the drug or to the degree of seriousness of reactions. We did not find any case of myocardial infarction or fracture related to TZD in the database. This is not surprising, since in any spontaneous reporting system, clinicians are unlikely to report this kind of event related to TZD, and instead attribute them to the baseline risk of type 2 diabetes. The absence of fractures reported to the French pharmacovigilance system does not mean that this risk is not real. As demonstrated in the meta-analysis of 10 randomized controlled trials and 2 observational studies, long-term use of TZD doubles the risk of fractures among women with type 2 diabetes, without a significant increase in the risk of fractures in diabetic men . In our study, reported ADRs in the exposed population has increased year by year since the marketing authorization of TZDs in France. This increase can be explained by the increased use of TZDs but also biased by reports related to the notoriety of TZD ADRs. This last point is limited as reports with TZD seem to be less frequently serious than for other diabetic patients.
Populations of patients with specific disease identified through the FPVD are very similar to that obtained through population-based studies in France [27, 28]. This population of type 2 diabetic patients with ADR related to their medications presents characteristics comparable to those observed in other studies about French type 2 diabetes [29–31]: for example, we found that 11% of the patients suffered from cardiac insufficiency, which is very similar to the 12% observed in the ENTRED national survey . Moreover, the patterns of exposure to drugs in this population are in agreement with the guidelines for TZD use at the time of the study (in particular, TZDs are contraindicated with insulin and for patients with NYHA class I to IV). In our study, patients exposed to TZDs were less likely to present risk factors of heart failure and cardiovascular comorbidities, 5.6% had a cardiac insufficiency, and less than 3% were treated concomitantly with insulin.
In the French Pharmacovigilance database, adverse drug reactions reported in diabetic patients exposed to thiazolidinediones (rosiglitazone and pioglitazone) present a degree of seriousness similar to that observed with other anti diabetic drugs. Thiazolidinediones exposure is associated with an increased risk of edema and heart failure in patients with type 2 diabetes even when recommendations for use are respected, and this risk concerns much rosiglitazone as pioglitazone. In contrast, the risk of hepatic reactions and myocardial infarction, which has been discussed with this class of drugs, is not higher than with other hypoglycemic agents.
The authors acknowledge the assistance of all 31 regional centres of the French Pharmacovigilance System through the "Association Française des Centres Régionaux de Pharmacovigilance" (AFCRPV).
The authors acknowledge Ms. Pascale Morandi for editing the manuscript.
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