Applicant/PHRC: Hetero Drugs South Africa (Pty) Ltd
Product proprietary name: HETRIPCO
Dosage form and strength: Film coated tablets; 600 mg of efavirenz, 200 mg of emtricitabine and 300 mg of tenofovir
disoproxil fumarate (which is equivalent to 245 mg of tenofovir)
Ketoconazole
itraconazole
concentration
↓ketoconazole
concentration
↓clarithromycin
concentration
↑14-OH
Medicine interaction studies with HETRIPCO and
ketoconazole have not been conducted. Efavirenz
has the potential to decrease plasma concentrations
of ketoconazole.
Anti-infective: Clarithromycin
Clinical
significance
unknown.
In
uninfected
volunteers, 46 % developed rash while receiving
efavirenz and clarithromycin. No dose adjustment of
HETRIPCO is recommended when given with
clarithromycin. Alternatives to clarithromycin, such
as azithromycin, should be considered. Other
macrolide antibiotics, such as erythromycin, have
not been studied in combination with HETRIPCO.
Increase daily dose of rifabutin by 50 %. Consider
doubling the rifabutin dose in regimens where
rifabutin is given 2 or 3 times a week.
metabolite
concentration
Antimycobacterial: Rifabutin
Antimycobacterial: Rifampicin
↓rifabutin
concentration
↓efavirenz
Clinical
significance
of
reduced
efavirenz
concentration
concentration is unknown. Dosing recommendations
for concomitant use of HETRIPCO and rifampicin
have not been established.
Calcium channel blockers:
Diltiazem
↓diltiazem
Diltiazem dose adjustments should be guided by
clinical response (refer to the complete professional
information for diltiazem). No dose adjustment of
HETRIPCO is necessary when administered with
diltiazem.
concentration
↓desacetyl
diltiazem
concentration
Others
↓N-monodes-
methyl diltiazem
concentration
No data are available on the potential interactions of
efavirenz with other calcium channel blockers that
are substrates of the CYP3A4 enzyme. The
(e.g. felodipine, nicardipine,
nifedipine, verapamil)
↓calcium channel potential
blocker
exists
for
reduction
in
plasma
concentrations of the calcium channel blocker. Dose
adjustments should be guided by clinical response
(refer to the complete professional information for
the calcium channel blocker).
HMG-CoA reductase inhibitors: ↓atorvastatin
Plasma concentrations of atorvastatin, pravastatin
Initials_____________
November 2021
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