Applicant /PHCR: Hetero Drugs South Africa (Pty) Ltd.
Product Proprietary name: Fovirem, Film – coated Tablet
Dosage form and strength: Emtricitabine 200 mg and Tenofovir Disoproxil fumarate 300 mg
combination with either lamivudine or emtricitabine, and either abacavir or didanosine. Therefore, cross-resistance
among these medicines may occur in patients whose virus harbours either or both of these amino acid substitutions.
Emtricitabine: Emtricitabine-resistant isolates (M184V/I) were cross-resistant to lamivudine and zalcitabine but
retained susceptibility in vitro to didanosine, stavudine, tenofovir, zidovudine, and NNRTls (delavirdine, efavirenz, and
nevirapine). Isolates from heavily treatment-experienced patients containing the M184V/I amino acid substitution in
the context of other NRTI resistance-associated substitutions may retain susceptibility to tenofovir. HIV-1 isolates
containing the K65R substitution, selected in vivo by abacavir, didanosine, tenofovir, and zalcitabine, demonstrated
reduced susceptibility to inhibition by emtricitabine. Viruses harbouring mutations conferring reduced susceptibility to
stavudine and zidovudine (M41L, D67N, K70R, L210W, T215Y/F, K219Q/E) ordidanosine (L74V) remained sensitive
to emtricitabine. HIV-1 containing the K103N substitution associated with resistance to NNRTls was susceptible to
emtricitabine.
Tenofovir disoproxil fumarate: HIV-1 isolates from patients (N = 20) whose HIV-1 expressed a mean of 3’
zidovudine-associated RT amino acid substitutions (M41L, D67N, K70R, L210W, T215Y/F or K219Q/E/N) showed a
3,1-fold decrease in the susceptibility to tenofovir. Multinucleoside resistant HIV-1 with a T69S double insertion
mutation in the RT showed reduced susceptibility to tenofovir.
Antiviral Activity:
Emtricitabine and tenofovir disoproxil fumarate: In combination studies evaluating the in vitro antiviral activity of
emtricitabine and tenofovir together, synergistic antiviral effects were observed.
Pharmacokinetic properties:
Pharmacokinetics in Adults
One tenofovir and emtricitabine combination tablet was bioequivalent to one emtricitabine capsule (200 mg) plus one
tenofovir disoproxil fumarate 300 mg tablet following single- dose administration to fasting healthy subjects (N=39).
Emtricitabine: The pharmacokinetic properties of emtricitabine are summarised in Table 1.
Initial: KB
20 May 2022 (esub0002-dvp)
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