Source: Health Products Regulatory Authority (ZA) Revision Year: 2022 Publisher: CIPLA MEDPRO (PTY) LTD., Building 9, Parc du Cap, Mispel Street, Bellville, 7530 Customer Care: 080 222 6662
Individuals should be fully informed about the use of precautionary measures including barrier contraception (condoms) that should be taken to prevent HIV-1 transmission in accordance with the national guidelines. Treatment compliance reduces risk but does not prevent the transmission of HIV-1 as TAFBIN is not indicated for prophylaxis.
Patients with chronic hepatitis B or C and treated with antiretroviral therapy are at an increased risk for severe and potentially fatal hepatic adverse reactions. The safety and efficacy of TAFBIN in patients co-infected with HIV-1 and Hepatitis C (HCV) have not been established.
Tenofovir alafenamide is active against hepatitis B virus (HBV). Discontinuation of TAFBIN therapy in patients co-infected with HIV and HBV may be associated with severe acute exacerbations of hepatitis. Patients co-infected with HIV and HBV who discontinue TAFBIN should be closely monitored with both clinical and laboratory follow-up for at least several months after stopping treatment. In patients with advanced liver disease or cirrhosis, treatment discontinuation is not recommended since post-treatment exacerbation of hepatitis may lead to hepatic decompensation.
Use of TAFBIN can result in hepatomegaly due to non-alcoholic fatty liver disease (hepatic steatosis). The safety and efficacy of TAFBIN has not been established in patients with significant underlying liver disorders/diseases. In case of concomitant antiviral therapy for hepatitis B or C, please also consult the relevant package inserts for these medicines. Patients with pre-existing liver dysfunction including chronic active hepatitis have an increased frequency of liver function abnormalities during combination antiretroviral therapy and should be monitored. If there is evidence of worsening liver disease in such patients, temporary or permanent discontinuation of treatment must be considered.
An increase in weight and in levels of blood lipids (hyperlipidaemia) and glucose may occur during antiretroviral therapy. Such changes may in part be linked to diseases control and lifestyle. For lipids, there is in some cases evidence for a treatment effect, while for weight gain there is no strong evidence relating this to any particular treatment. For monitoring of blood lipids and glucose reference is made to established HIV treatment guidelines. Lipid disorders should be managed as clinically appropriate.
Nucleoside and nucleotide analogues such as TAFBIN have been demonstrated in vitro and in vivo to cause a variable degree of mitochondrial damage. There have been reports of mitochondrial dysfunction in HIV negative infants exposed in utero and/or post-natally to nucleoside analogues. Manifestations of mitochondrial dysfunction include haematological disorders (anaemia, neutropenia), peripheral neuropathy and metabolic disorders (hyperlactataemia, lactic acidosis, hyperlipasaemia). Some late-onset neurological disorders have been reported (hypertonia, convulsion, abnormal behaviour). It is not known whether the neurological disorders are transient or permanent. Possible mitochondrial dysfunction should be considered in any new-born/infant/child exposed in utero to nucleoside or nucleotide analogues, including HIV negative infants/children who present with severe clinical findings of unknown etiology, particularly neurologic findings. Their babies/infants and children should have clinical, and laboratory follow up and be fully investigated for possible mitochondrial dysfunction.
Lactic acidosis and severe hepatomegaly with steatosis, including fatal cases, have been reported with the use of nucleoside analogs, including emtricitabine, a component of TAFBIN, and tenofovir disoproxil fumarate, another prodrug of tenofovir, alone or in combination with other antiretrovirals. Treatment with TAFBIN should be suspended in any individual who develops clinical or laboratory findings suggestive of lactic acidosis or pronounced hepatotoxicity (which may include hepatomegaly and steatosis even in the absence of marked transaminase elevations). Clinical features of lactic acidosis are non-specific, and include nausea, vomiting, abdominal pain, dyspnoea, fatigue and weight loss.
In patients with suspicious symptoms or biochemistry, measure the venous lactate level (normal <2 mmol/L) and the serum bicarbonate and respond as follows:
Caution should be exercised when administering TAFBIN to patients with known risk factors for liver disease.
Immune Reactivation Syndrome (IRS) is an immunopathological response resulting from the rapid restoration of pathogen-specific immune responses to pre-existing antigens combined with immune dysregulation, which occurs shortly after starting combination antiretroviral therapy (cART). Typically, such reaction presents by paradoxical deterioration of opportunistic infections being treated or with unmasking of an asymptomatic opportunistic disease, often with an atypical inflammatory presentation. IRS usually develops within the first three months of initiation of ART and occurs more commonly in patients with low CD4+ counts. Relevant examples include cytomegalovirus retinitis, generalised and/or focal mycobacterial and other infections such as tuberculosis, cryptococcal meningitis and Pneumocystis jirovecii pneumonia. Appropriate treatment of the opportunistic infections and diseases should be instituted or continued, and ART continued. Inflammatory manifestations generally subside after a few weeks. Severe cases may respond to glucocorticoids, but there is only limited evidence for this in patients with tuberculosis IRS.
Autoimmune disorders (such as Graves' disease and autoimmune hepatitis) have also been reported to occur in the setting of immune reactivation however, the reported time to onset is more variable and these events can occur many months after initiation of treatment.
TAFBIN should not be started in antiretroviral-experienced patients with HIV-1 harbouring the K65R mutation (see section 5.1)
There have been reports of a high rate of virological failure and of emergence of resistance at an early stage when tenofovir disoproxil was combined with lamivudine and abacavir as well as with lamivudine and didanosine as a once daily regimen. Therefore, the same problems may be seen if TAFBIN is administered with a third nucleoside analogue.
Patients receiving TAFBIN should be advised that they may continue to develop opportunistic infections and other complications of HIV infection, and therefore they should remain under close observation by healthcare professionals experienced in the treatment of patients with associated HIV disease. Regular monitoring of viral load and CD4 counts needs to be done.
Although the aetiology is considered to be multifactorial (including corticosteroid use, alcohol consumption, severe immunosuppression, higher body mass index), cases of osteonecrosis have been reported, particularly in patients with advanced HIV-disease and/or long-term exposure to combination antiretroviral therapy (cART). Patients should be advised to seek medical advice if they experience joint aches and pain, joint stiffness, or difficulty in movement.
A potential risk of nephrotoxicity resulting from chronic exposure to low levels of tenofovir due to dosing with tenofovir alafenamide cannot be excluded (see section 5.3).
TAFBIN should generally be avoided but may be used in adults with end stage renal disease (estimated CrCl ˂15 mL/min) on chronic haemodialysis with close monitoring for the risks (see section 4.2).
The co-administration of TAFBIN is not recommended with certain anticonvulsants (e.g., carbamazepine, oxcarbazepine, phenobarbitone and phenytoin), antimycobacterials (e.g., rifampicin, rifabutin, rifapentine), boceprevir, St. John's wort and HIV protease inhibitors (PIs) other than atazanavir, lopinavir and darunavir (see section 4.5). TAFBIN should not be administered concomitantly with medicines containing tenofovir alafenamide, tenofovir disoproxil, emtricitabine, lamivudine or adefovir dipivoxil.
The safety and efficacy of TAFBIN in children younger than 12 years of age, or weighing ˂35 kg, have not been established. No data are available.
Studies in the elderly have not been conducted. However, dose selection for the elderly patients should be cautious, keeping in mind the greater frequency of decreased hepatic, renal, or cardiac function, and of concomitant disease or other medicine therapy.
Interaction studies have only been performed in adults.
In vitro and clinical pharmacokinetic interaction studies have shown that the potential for CYP-mediated interactions involving emtricitabine with other medicines is low. Co-administration of emtricitabine with medicines that are eliminated by active tubular secretion may increase concentrations of emtricitabine, and/or the co-administered medicine. Medicines that decrease renal function may increase concentrations of emtricitabine.
Tenofovir alafenamide is transported by P-glycoprotein (P-gp_ and breast cancer resistance protein (BCRP). Medicines that strongly affect P-gp and BCRP activity may lead to changes in tenofovir alafenamide absorption. Medicines that induce P-gp activity (e.g., rifampicin, rifabutin, carbamazepine, phenobarbital) are expected to decrease the absorption of tenofovir alafenamide, resulting in decreased plasma concentration of tenofovir alafenamide, which may lead to loss of therapeutic effect of TAFBIN and development of resistance. Co-administration of TAFBIN with other medicines that inhibit P-gp and BCRP activity (e.g., cobicistat, ritonavir, ciclosporin) is expected to increase the absorption of tenofovir alafenamide and xanthine oxidase inhibitors (e.g., febuxostat) is not expected to increase systemic exposure to tenofovir in vivo.
Tenofovir alafenamide is not an inhibitor of CYP1A2, CYP2B6, CYP2C8, CYP2C9, CYP2C19 or CYP2D6 in vitro. It is not an inhibitor or inducer of CYP3A in vivo. Tenofovir alafenamide is a substrate of OATP1B1 and OATP1B3 in vitro. The distribution of tenofovir alafenamide in the body may be affected by the activity of OATP1B1 and OATP1B3.
Tenofovir alafenamide is not an inhibitor of human uridine diphosphate glucuronosyltransferase (UGT) 1A1 in vitro. It is not known whether tenofovir alafenamide is an inhibitor of other UGT enzymes. Emtricitabine did not inhibit the glucuronidation reaction of a non-specific UGT substrate in vitro.
Interactions between the individual components of TAFBIN and other medicines:
| Medicine by therapeutic area | Effect on medicine levels | Recommendation concerning co- administration with TAFBIN |
|---|---|---|
| ANTI-INFECTIVES | ||
| Antifungals | ||
| Ketoconazole Itraconazole | Interaction not studied with either of the components of TAFBIN. Co-administration of ketoconazole or itraconazole, which are potent P-gp inhibitors, is expected to increase plasma concentrations of tenofovir alafenamide. | The recommended dose of TAFBIN is 200 mg/10 mg once daily. |
| Fluconazole Isavuconazole | Interaction not studied with either of the components of TAFBIN. Co-administration of fluconazole or isavuconazole may increase plasma concentrations of tenofovir alafenamide. | Dose TAFBIN according to the concomitant antiretroviral (see section 4.2). |
| Antimycobacterials | ||
| Rifabutin Rifampicin Rifapentine | Interaction not studied with either of the components of TAFBIN. Co-administration of rifampicin, rifabutin and rifapentine, all of which are P-gp inducers, may decrease tenofovir alafenamide plasma concentrations, which may result in loss of therapeutic effect and development of resistance. | Co-administration of TAFBIN and rifabutin, rifampicin or rifapentine is not recommended. |
| Anti-hepatitis C virus medicines | ||
| Ledipasvir (90 mg once daily) Sofosbuvir (400 mg once daily) Emtricitabine (200 mg once daily) Alafenamide (10 mg once daily) | Ledipasvir: AUC: Increases 79% Cmax: Increases 65% Cmin: Increases 93% Sofosbuvir: AUC: Increases 47% Cmax: Increases 29% Sofosbuvir metabolite GS-331007: AUC: Increases 48% Cmax: No change Cmin: Increases 66% Emtricitabine: AUC: No change Cmax: No change Cmin: No change Tenofovir alafenamide: AUC: No change Cmax: No change | No dose adjustment of ledipasvir or sofosbuvir is required. Dose TAFBIN according to the concomitant antiretroviral (see section 4.2). |
| Ledipasvir (90 mg once daily) Sofosbuvir (400 mg once daily) Emtricitabine (200 mg once daily) Alafenamide (25 mg once daily) | Ledipasvir: AUC: No change Cmax: No change Cmin: No change Sofosbuvir: AUC: No change Cmax: No change Sofosbuvir metabolite GS-331007: AUC: No change Cmax: No change Cmin: No change Emtricitabine: AUC: No change Cmax: No change Cmin: No change Tenofovir alafenamide: AUC: Increases 32% Cmax: No change | No dose adjustment of ledipasvir or sofosbuvir is required. Dose TAFBIN according to the concomitant antiretroviral (see section 4.2). |
| Sofosbuvir (400 mg once daily) Velpatasvir (100 mg once daily) Emtricitabine (200 mg once daily) Alafenamide (10 mg once daily) | Sofosbuvir: AUC: Increases 37% Cmax: No change Sofosbuvir metabolite GS-331007: AUC: Increases 48% Cmax: No change Cmin: Increases 58% Velpatasvir: AUC: Increases 50% Cmax: Increases 30% Cmin: Increases 60% Emtricitabine: AUC: No change Cmax: No change Cmin: No change Tenofovir alafenamide: AUC: No change Cmax: Decreases 20% | No dose adjustment of sofosbuvir, velpatasvir or voxilaprevir is required. Dose TAFBIN according to the concomitant antiretroviral (see section 4.2). |
| Sofosbuvir/ Velpatasvir/ Voxilaprevir (400 mg/ 100 mg/ 100 mg + 100 mg once daily) Emtricitabine (200 mg once daily)/ Tenofovir alafenamide (10 mg once daily) | Sofosbuvir: AUC: No change Cmax: Increases 27% Sofosbuvir metabolite GS-331007: AUC: Increases 43% Cmax: No change Velpatasvir: AUC: No change Cmin: Increases 46% Cmax: No change Voxilaprevir: AUC: Increases 171% Cmin: Increases 350% Cmax: Increases 92% Emtricitabine: AUC: No change Cmin: No change Cmax: No change Tenofovir alafenamide: AUC: No change Cmax: Decreases 21% | No dose adjustment of sofosbuvir, velpatasvir or voxilaprevir is required. Dose TAFBIN according to the concomitant antiretroviral (see section 4.2). |
| Sofosbuvir/ Velpatasvir/ Voxilaprevir (400 mg/100 mg/ 100 mg + 100 mg once daily) Emtricitabine (200 mg once daily)/ Tenofovir alafenamide (25 mg once daily) | Sofosbuvir: AUC: No change Cmax: No change Sofosbuvir metabolite GS-331007: AUC: No change Cmax: No change Velpatasvir: AUC: No change Cmin: No change Cmax: No change Voxilaprevir: AUC: No change Cmin: No change Cmax: No change Emtricitabine: AUC: No change Cmin: No change Cmax: No change Tenofovir alafenamide: AUC: Increases 52% Cmax: Increases 32% | No dose adjustment of sofosbuvir, velpatasvir pr voxilaprevir is required. Dose TAFBIN according to the concomitant antiretroviral (see section 4.2). |
| ANTIRETROVIRALS | ||
| HIV protease inhibitors | ||
| Atazanavir/Cobicistat (300 mg/ 150 mg once daily), Tenofovir alafenamide (10 mg) | Tenofovir alafenamide: AUC: Increases 75% Cmax: Increases 80% Atazanavir: AUC: No change Cmax: No change Cmin: No change | The recommended dose of TAFBIN is 200 mg/10 mg once daily. |
| Atazanavir/Ritonavir (300 mg/100 mg once daily), Tenofovir alafenamide (10 mg once daily) | Tenofovir alafenamide: AUC: Increases 91% Cmax: Increases 77% Atazanavir: AUC: No change Cmax: No change Cmin: No change | The recommended dose of TAFBIN is 200 mg/10 mg once daily) |
| Darunavir/Cobicistat (800 mg/150 mg once daily), Tenofovir alafenamide (25 mg once daily) | Tenofovir alafenamide: AUC: No change Cmax: No change Tenofovir: AUC: Increases 224% Cmax: Increases 216% Cmin: Increases 221% Darunavir: AUC: No change Cmax: No change Cmin: No change | The recommended dose of TAFBIN is 200 mg/10 mg once daily. |
| Darunavir/Ritonavir (800 mg/100 mg once daily), Tenofovir alafenamide (10 mg once daily) | Tenofovir alafenamide: AUC: No change Cmax: No change Tenofovir: AUC: Increases 105% Cmax: Increases 142% Darunavir: AUC: No change Cmax: No change Cmin: No change | The recommended dose of TAFBIN is 200 mg/10 mg once daily. |
| Lopinavir/Ritonavir (800 mg/200 mg once daily), Tenofovir alafenamide (10 mg once daily) | Tenofovir alafenamide: AUC: Increases 47% Cmax: Increases 119% Lopinavir: AUC: No change Cmax: No change Cmin: No change | The recommended dose of TAFBIN is 200 mg/10 mg once daily. |
| Tipranavir/Ritonavir | Interaction not studied with either of the components of TAFBIN. Tipranavir/Ritonavir results in P-gp induction. Tenofovir alafenamide exposure is expected to decrease when tipranavir/ritonavir is used in combination with TAFBIN. | Co-administration with TAFBIN is not recommended. |
| Other protease inhibitors | Effect is unknown. | There are no data available to make dosing recommendations for co- administration with other protease inhibitors. |
| Other HIV antiretrovirals | ||
| Dolutegravir (50 mg once daily), tenofovir alafenamide (10 mg once daily) | Tenofovir alafenamide: AUC: No change Cmax: No change Dolutegravir: AUC: No change Cmax: No change Cmin: No change | The recommended dose of TAFBIN is 200 mg/25 mg once daily. |
| Rilpivirine (25 mg once daily), Tenofovir alafenamide (25 mg once daily) | Tenofovir alafenamide: AUC: No change Cmax: No change Rilpivirine: AUC: No change Cmax: No change Cmin: No change | The recommended dose of TAFBIN is 200 mg/25 mg once daily. |
| Efavirenz (600 mg once daily), Tenofovir alafenamide (40 mg once daily) | Tenofovir alafenamide: AUC: Decreases 14% Cmax: Decreases 22% | The recommended dose of TAFBIN is 200 mg/25 mg once daily. |
| Maraviroc Nevirapine Raltegravir | Interaction not studied with either of the components of TAFBIN. Tenofovir alafenamide exposure is not expected to be affected by maraviroc, nevirapine or raltegravir, nor is it expected to affect the metabolic pathways relevant to maraviroc, nevirapine or raltegravir. | The recommended dose of TAFBIN is 200 mg/25 mg once daily. |
| ANTICONVULSANTS | ||
| Oxcarbazepine Phenobarbitone Phenytoin | Interaction not studied with either of the components of TAFBIN. Co-administration of oxcarbazepine, phenobarbitone or phenytoin, all of which are P-gp inducers, may decrease Tenofovir alafenamide plasma concentrations, which may result in loss of therapeutic effect and development of resistance. | Co-administration of TAFBIN and oxcarbazepine, phenobarbitone or phenytoin is not recommended |
| Carbamazepine (Titrated from 100 mg to 300 mg twice a day), Emtricitabine/ Tenofovir alafenamide (200 mg/25 mg once daily) | Tenofovir alafenamide: AUC: Decreases 55% Cmax: Decreases 57% Co-administration of carbamazepine, a P-gp inducer, decreases tenofovir alafenamide plasma concentrations which may result in loss of therapeutic effect and development of resistance. | Co-administration of TAFBIN and carbamazepine is not recommended. |
| ANTIDEPRESSANTS | ||
| Sertraline (50 mg once daily), Tenofovir alafenamide (10 mg once daily) | Tenofovir alafenamide: AUC: No change Cmax: No change Sertraline: AUC: Increases 9% Cmax: Increases 14% | No dose adjustment of Sertraline is required. Dose TAFBIN according to the concomitant antiretroviral (see section 4.2) |
| HERBAL PRODUCTS | ||
| St. John's wort (Hypericum perforatum) | Interaction not studied with either of the components of TAFBIN. Co-administration of St. John's wort, a P-gp inducer, may decrease tenofovir alafenamide plasma concentrations which may result in loss of therapeutic effect and development of resistance. | Co-administration of TAFBIN with St. John's wort is not recommended. |
| IMMUNOSUPRESSANTS | ||
| Ciclosporin | Interaction not studied with either of the components of TAFBIN. Co-administration of ciclosporin, a potent P-gp inhibitor, is expected to increase plasma concentrations of tenofovir alafenamide. | The recommended dose of TAFBIN is 200 mg/10 mg once daily. |
| ORAL CONTRACEPTIVES | ||
| Norgestimate (0,180/ 0,215/ 0,250 mg once daily), Ethinylestradiol (0,025 mg once daily), Emtricitabine/ Tenofovir alafenamide (200 mg/25 mg once daily) | Norelgestromin: AUC: No change Cmin: No change Cmax: No change Norgestrel: AUC: No change Cmin: No change Cmax: No change Ethinylestradiol: AUC: No change Cmin: No change Cmax: No change | No dose adjustment of norgestimate/ ethinylestradiol is required. Dose TAFBIN according to the concomitant antiretroviral (see section 4.2). |
| SEDATIVE/HYPNOTICS | ||
| Orally administered Midazolam (2,5 mg single dose), Tenofovir alafenamide (25 mg once daily) | Midazolam: AUC: No change Cmax: No change | No dose adjustment of midazolam is required. Dose TAFBIN according to the concomitant antiretroviral (see section 4.2) |
| Intravenously administered Midazolam (1 mg single dose), Tenofovir alafenamide (25 mg once daily) | Midazolam: AUC: No change Cmax: No change | |
There are limited data in pregnant women. TAFBIN should not be used during pregnancy (see section 4.3).
TAFBIN should not be used by women breastfeeding their babies as possible harm to their babies cannot be excluded (see section 4.3). Emtricitabine is excreted in human milk and animal studies show that tenofovir is excreted in milk. In order to avoid transmission of HIV to the infant it is recommended that HIV infected women do not breastfeed their infants under any circumstances.
There are no data on fertility from the use of TAFBIN in humans. In animal studies there were no effects of emtricitabine and tenofovir alafenamide on mating or fertility parameters.
TAFBIN has a moderate influence on the ability to drive and use machines. TAFBIN may affect the ability to drive and use machines. Patients should not drive and use machines until they know how treatment with TAFBIN affects them. Patients should be informed that dizziness and fatigue have been reported during treatment with TAFBIN.
Assessment of adverse reactions based on safety data from studies performed in HIV infected patients who received medicines containing emtricitabine and tenofovir alafenamide, as in TAFBIN, and from post-marketing experience showed that the most frequently reported adverse reactions were diarrhoea, nausea and headache.
Tabulated summary of adverse reactions:
| Blood and lymphatic system disorders | |
| Less frequent | Anaemia. |
| Psychiatric disorders | |
| Frequent | Abnormal dreams. |
| Nervous system disorders | |
| Frequent | Headache, dizziness. |
| Gastrointestinal disorders | |
| Frequent | Nausea, diarrhoea, vomiting, abdominal pain, flatulence. |
| Less frequent | Dyspepsia. |
| Skin and subcutaneous tissue disorders | |
| Frequent | Rash. |
| Musculoskeletal and connective tissue disorders | |
| Less frequent | Arthralgia. |
| General disorders and administration site conditions | |
| Frequent | Fatigue. |
Post marketing reported side effects:
| Blood and lymphatic system disorders |
| Anaemia. |
| Psychiatric disorders |
| Angiodema. |
Metabolic parameters – Weight and levels of blood lipids and glucose may increase during TAFBIN therapy.
According to studies performed, the safety profile of emtricitabine and tenofovir alafenamide given with elvitegravir and cobicistat to adolescents was similar to that in adults.
Reporting suspected adverse reactions after authorisation of the medicine is important. It allows continued monitoring of the benefit/risk balance of the medicine. Healthcare professionals are asked to report any suspected adverse reactions to SAHPRA via the "6.04 Adverse Drug Reaction Reporting 359 Form", found online under SAHPRA's publications: https://www.sahpra.org.za/Publications/Index/8, or to Cipla Medpro (Pty) Ltd. by email (drugsafetysa@cipla.com) or telephone: 080 222 6662 (toll free).
Not applicable.
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