Pharmacology of generics. Dario Cattaneo Unit of Clinical Pharmacology Luigi Sacco University Hospital, Milano, ITALY

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1 Pharmacology of generics Dario Cattaneo Unit of Clinical Pharmacology Luigi Sacco University Hospital, Milano, ITALY

2

3 Generics are effective drugs -Laurent, Lancet

4 that have improved access to therapy : pregeneric era : generic era : free rollout persons in the pregeneric era took 3.25 times longer to initiate ART versus the generic era and persons in the free rollout era initiated ART more rapidly than the generic era...

5 and reduced costs of therapy individuals in UK taking antiretrovirals in 2014 estimated rise: 8% per year Cost of patented drugs taken from the British Formulary (30% discount) cost of generics estimated using a 80% discount from patented drugs The total predicted saving over five years from a switch to generics was 1.1 billion

6 .changing the use of available resources.. a stochastic computer simulation model to project the distribution of lifetime outcomes and costs of MSM infected with HIV in 2013 aged 30 in UK From 60%...

7 Distribution of cost spent in an average lifetime in analysis if patented drugs are replaced by generics..to 32%...

8 The cumulative use of generic drugs and new drugs would lead to annual savings of 4.6 million (-0.6 %) in 2015; 16.9 million (-2.1 %) in 2016; 19.4 million (-2.4 %) in 2017; 51.1 million (-6.1 %) in 2018 and million (-12.8 %) in 2019.

9 However

10 Concerns from Spanish experience Local database including 434 HIV patients 75 pts switched to generics 150 pts maintained on FDCs Exposed group Non-exposed group Adverse events (%) 18.7% 1.3% Cost of ART ( ) Cost of AEs ( ) Cost of extra visit ( ) Total cost ( ) Total cost per day ( ) Homar et al, Health Economics Review

11

12 Why the use of generics may be eventually associated with health losses?

13 randomized, two period, two-sequence with cross-over design single dose washout of at least 5 half-lives healthy volunteers (mainly males, not less than 12 subjects) 18 or older with a BMI between 18.5 and 30 Kg/m2 preferably non-smokers and without a history of alcohol or drug abuse bioequivalence studies should be conducted under fasting conditions PK parameters to be evaluated: AUC 0-t, AUC 0-inf, and C max (T max?)

14 1 st issue: methodological drawbacks of the actual guidelines for the assessment of bioequivalence Pharmacokinetic evaluations done after single dose administration and not at steady state (trough conc. missing) Bioequivalence between different generics of the same originator not required (substitution of one generic for another is likely to occur ) Bioequivalence is too permissive. The 90% confidence interval for the ratio of the AUC/Cmax between the test and reference products should be within the interval of %; eventually widened up to % Lack of clear definition to identify narrow therapeutic index drugs for which the interval of acceptance should be reduced to %.

15 the still unaddressed issue of Tmax. Same AUC, same C max.completely different T max. Despite the significant difference in absorption rate the FDA considers these two products bioequivalent. Do you agree with this? - Bate, TIPS in press

16 the importance to test BE both in fed and fasted conditions. - Van Gelder, Transplant Int

17 Peculiarities of antiretrovirals Concentration-dependent activity (efficacy/safety) (PI, NNRTI) Low genetic barrier with risk to develop cross resistance if drugs are chronically underdosed (NNRTI) Availability of fixed-dose combinations associated with higher patients compliance compared with single treatments Accordingly, some (not all!) ARVdrugs could be considered as critical dose drugs

18 2 nd issue :the unpacking of FDC Negative significant associations between pill burden and adherence (A) or virologic suppression (B) were found - Nachega, CID May

19 Patients 76% accepted generics 55% have confidence in generics 44% accepted switching of ARVs for generics 17% accepted switching if the pill burden increase Pysicians 75% would prescribe generics (26% if the combo had to be broken) Main reasons for non prescription of generics were: previous branded ARV-induced side effects (35%) refusal of generics overall (37%) lack of understanding generics (26%) risk of non-observance of treatment (44%)

20 3 th issue: peculiarities of the diseases.. HIV disease as been associated with: lower cytochrome activity (altered cytokine production) elevated gastric ph altered serum protein concentrations atrophy of the absorptive surface in the GI tract - Mukonzo, Clin Pharmacokinet Are pharmacokinetic/be studies done in healthy volunteers really representative of what happens in the HIV-infected patients?

21 Lopinavir Saquinavir Ritonavir Healthy volunteers HIV-infected patients Differences: 30-50%

22 Evidences from literature Bioequivalence (BE) studies ( ) 34 BE studies in healthy volunteerrs 26 - Studies showing BE of generic antiretrovirals 22 (85%) - Studies with BE confirmed at % 26 (100%) - Studies with BE confirmed at % 0 BE studies in HIV-infected patients 8 - Studies with BE confirmed at % 8 - Studies with BE confirmed at % 0 - Studies carried out at steady state 5 - Studies showing bioequivalence 1 (12.5%)

23 Which differences have been observed?

24 Ratio (90% CI) Comparison between branded and generic FDCs containing stavudine, lamivudine and nevirapine (Triomune) Stavudine Lamivudine Nevirapine Cmax 1.4 ( ) 1.1 ( ) 0.9 ( ) AUC 1.1 ( ) 1.1 ( ) 0.9 ( ) Cmax 0.9 ( ) 1.1 ( ) 0.8 ( ) AUC 0.8 ( ) 1.0 ( ) 0.9 ( ) Cmax 1.3 ( ) 0.8 ( ) 1.1 ( ) AUC 1.1 ( ) 0.8 ( ) 1.1 ( ) 1.Hosseinipour, AIDS 2007 ; 2. Byakika-Kibwika, JAC 2008; 3.Byakika-Tusiiime Plos ONE 2008

25 +67%!!! - Tarinas, Farm Hosp

26 37 HIV-patients on Kaletra were switched to generic lopinavir/ritonavir (Matrix Laboratories) Lopinavir C trough (ng/ml) Kaletra generico +30% Ritonavir C trough (ng/ml) % van der Lugt, Antiviral Ther

27 Are such differences related to inadequate quantitative and qualitative drug contents?

28 - Zucman, AIDS,

29 Quantitative/qualitative analyses were performed to evaluate the content and quality of the compounds: - lopinavir: mass 215 mg (theoretical 200 mg) - ritonavir: mass 50.8 mg (theoretical 50 mg) - Zucman, AIDS,

30 Quantitative/qualitative analyses were performed to evaluate the content and quality of the compounds: - lopinavir: mass 215 mg (theoretical 200 mg) - ritonavir: mass 50.8 mg (theoretical 50 mg) Pk evaluations revealed that Arga-L had a bioavailability of 10% compared with Kaletra 400/100 mg ARGA-L 400/100 mg Kaletra Trough LPV (ng/ml) RTV ng/ml LPV (ng/ml) RTV ng/ml Median (IQR) 158 ( ) 14 (13-20) 3884 ( ) 98 (89-124) - Zucman, AIDS,

31 Quality of antiretroviral drugs dispensed from developing countries and internet pharmacies 2027 tablets obtained from 8 Countries and 5 internet pharmacies (88 distinct samples) HIV drug tested: zidovudine, lamivudine, efavirenz, nevirapine Quality was assessed using the US Pharmacopoeia (USP 32-NF 27) samples analyzed for drug content, dissolution, uniformity, breaking force Drug content % All samples met the USP standards for drug content with a range of % - Wang, J Clin Pharm Ther

32 Quality of antiretroviral drugs dispensed from developing countries and internet pharmacies 98% of samples met the USP criteria for content uniformity 100% of samples met the USP criteria for breaking force 10% samples failed the dissolution test - Wang, J Clin Pharm Ther

33 Comparison of the in vivo pharmacokinetics and in vitro dissolution of branded versus generic efavirenz formulation in HIV-infected patients Dept. Infectious Diseases and Unit of Clinical Pharmacology, L. Sacco Universiy Hospital, Milano Dept. Pharmaceutical Sciences, Università degli Studi di Milano Dept. Infectious Diseases, Ospedale Galliera, Genova Unit of Infectious Diseases, Ospedale San Paolo, Milano Efavirenz concentrations (collected at h after the evening dose intake) were compared in vivo in HIV patients given Sustiva (n=83) or EFV Mylan (n=26) using a parallel design (at steady state). Dissolution tests were conducted according to United States Pharmacopeia (USP) 37 guidelines by comparing the similarity factor (f2), estimated using the following formula: f2 = 50 x log {[1 + (1/n Σ (Rt Tt)2] -0.5 x 100} Where n is the number of time points, Rt is the dissolution value of the reference batch at time t, and Tt is the dissolution value of the test batch at time t. Two profiles are considered identical for f2=100, similar for f2>50 or dissimilar (f2<50). - Cattaneo et al, TDM, in press

34 [EFV], ng/ml Box plot of EFV concentrations measured in HIV-infected patients given Sustiva (n=48) versus generic efavirenz (n=36) [EFV], ng/ml Sparse EFV concentrations Estimated EFV trough concentrations p=0.393 p= Sustiva Efavirenz Mylan 0 Sustiva Efavirenz Mylan - Cattaneo et al, TDM, in press

35 Comparison of the in vivo pharmacokinetics and in vitro dissolution of branded versus generic efavirenz formulation in HIV-infected patients The two formulations showed also comparable interindividual variability in EFV concentrations (with CV% values of 53% vs. 49% with Sustiva vs. generic EFV, respectively; p=0.785). Both EFV formulations resulted in a complete and fast release of EFV in the in vitro dissolution tests conducted in USP 37 conditions. Indeed, both formulations obtained a f2*=60 and resulted as similar. *similarity factor - Cattaneo et al, TDM, in press

36 strengths and limitations Pk evaluations done in HIV patients Pk evaluations done at steady state PK results supported by in vitro assessments Parallel design Lack of detailed Pk data (Cmax, AUC) Differences in the sampling time? Differences in the genetic background?

37 A RANDOMIZED, CROSS-OVER, BIOEQUIVALENCE STUDY OF EFAVIRENZ TABLETS 600 mg OF MYLAN SpA AND SUSTIVA (EFAVIRENZ) TABLETS 600 mg OF BRISTOL MYERS SQUIBB AT STEADY STATE IN PATIENTS WITH HIV-1 Approved by Agenzia Italiana del Farmaco (AIFA): December 2, 2015 Approved by our Ethical Committee (L. Sacco Hospital): December 4, 2015

38 Some lessons from immunosuppressive drugs

39 - Molnar, BMJ June

40 - Molnar, BMJ June

41 some key points still to be discussed on generic antiretrovirals Harmonize international guidelines for BE identification of critical dose drugs (NTI) use more stringent criteria to assess BE for NTIs confirm of BE in patients avoid consecutive substitutions between generics verify the quality of the product verify the pharmaceutical properties of generics Evaluate the impact of generics on adherence (vs FDC) verify efficacy and safety of generics in real life Perform detailed pharmacoeconomics analyses

42 Conclusions The widespread use of generics (that are for sure effective drugs!!) is mandatory to save money and reallocate available funds. Novel, more restrictive criteria are, however, required at least for the approval of critical-dose antiretrovirals National and international authorities and funding agencies should require that quality-assurance processes are conducted and approved before that generic antiretrovirals are made available to patients The impact of generic antiretrovirals on PK/clinical outcomes (bioavailability, efficacy, toxicity, adherence) should be monitored in real life scenarios

43 Thank you!

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