Abacavir - Warnings and Precautions

5 WARNINGS AND PRECAUTIONS • Hepatotoxicity has been reported in patients receiving a dolutegravir-containing regimen.

Monitoring for hepatotoxicity is recommended. • Lactic acidosis and severe hepatomegaly with steatosis, including fatal cases, have been reported with the use of nucleoside analogues. • Immune reconstitution syndrome has been reported in patients treated with combination antiretroviral therapy. • TRIUMEQ tablets and TRIUMEQ PD tablets for oral suspension are not substitutable. ( 2.3 , 5.7 ) 5.1 Hypersensitivity Reactions Hypersensitivity reactions have been reported with the use of abacavir or dolutegravir, components of TRIUMEQ and TRIUMEQ PD.

Abacavir Serious and sometimes fatal hypersensitivity reactions have occurred with abacavir-containing regimens.

See full prescribing information for ZIAGEN (abacavir).

Abacavir hypersensitivity reactions have included multi-organ failure and anaphylaxis and typically occurred within the first 6 weeks of treatment with abacavir (median time to onset was 9 days); although abacavir hypersensitivity reactions have occurred any time during treatment [see Adverse Reactions ] .

Patients who carry the HLA‑B*5701 allele are at a higher risk of abacavir hypersensitivity reactions; although, patients who do not carry the HLA‑B*5701 allele have developed hypersensitivity reactions.

Hypersensitivity to abacavir was reported in approximately 206 (8%) of 2,670 patients in 9 clinical trials with abacavir-containing products where HLA‑B*5701 screening was not performed.

The incidence of suspected abacavir hypersensitivity reactions in clinical trials was 1% when subjects carrying the HLA-B*5701 allele were excluded.

In any patient treated with abacavir, the clinical diagnosis of hypersensitivity reaction must remain the basis of clinical decision making.

Due to the potential for severe, serious, and possibly fatal hypersensitivity reactions with abacavir: • All patients should be screened for the HLA‑B*5701 allele prior to initiating therapy with TRIUMEQ or TRIUMEQ PD or reinitiation of therapy with TRIUMEQ or TRIUMEQ PD, unless patients have a previously documented HLA‑B*5701 allele assessment. • TRIUMEQ and TRIUMEQ PD are contraindicated in patients with a prior hypersensitivity reaction to abacavir and in HLA‑B*5701‑positive patients. • Before starting TRIUMEQ or TRIUMEQ PD, review medical history for prior exposure to any abacavir-containing product.

NEVER restart TRIUMEQ or TRIUMEQ PD or any other abacavir-containing product following a hypersensitivity reaction to abacavir, regardless of HLA‑B*5701 status. • To reduce the risk of a life‑threatening hypersensitivity reaction, regardless of HLA‑B*5701 status, discontinue TRIUMEQ or TRIUMEQ PD immediately if a hypersensitivity reaction is suspected, even when other diagnoses are possible (e.g., acute onset respiratory diseases such as pneumonia, bronchitis, pharyngitis, or influenza; gastroenteritis; or reactions to other medications).

Clinical status, including liver chemistries, should be monitored and appropriate therapy initiated. • If a hypersensitivity reaction cannot be ruled out, do not restart TRIUMEQ or TRIUMEQ PD or any other abacavir-containing products because more severe symptoms, which may include life-threatening hypotension and death, can occur within hours. • Clinically, it is not possible to determine whether a hypersensitivity reaction with TRIUMEQ or TRIUMEQ PD would be caused by abacavir or dolutegravir.

Therefore, never restart TRIUMEQ or TRIUMEQ PD or any other abacavir- or dolutegravir-containing product in patients who have stopped therapy with TRIUMEQ or TRIUMEQ PD due to a hypersensitivity reaction. • If a hypersensitivity reaction is ruled out, patients may restart TRIUMEQ or TRIUMEQ PD.

Rarely, patients who have stopped abacavir for reasons other than symptoms of hypersensitivity have also experienced life-threatening reactions within hours of reinitiating abacavir therapy.

Therefore, reintroduction of TRIUMEQ or TRIUMEQ PD, or any other abacavir-containing product, is recommended only if medical care can be readily accessed. • A Medication Guide and Warning Card that provide information about recognition of abacavir hypersensitivity reactions should be dispensed with each new prescription and refill.

Dolutegravir Hypersensitivity reactions have been reported and were characterized by rash, constitutional findings, and sometimes organ dysfunction, including liver injury.

The events were reported in <1% of subjects receiving TIVICAY in Phase 3 clinical trials.

Discontinue TRIUMEQ or TRIUMEQ PD and other suspect agents immediately if signs or symptoms of hypersensitivity reactions develop (including, but not limited to, severe rash or rash accompanied by fever, general malaise, fatigue, muscle or joint aches, blisters or peeling of the skin, oral blisters or lesions, conjunctivitis, facial edema, hepatitis, eosinophilia, angioedema, difficulty breathing).

Clinical status, including liver aminotransferases, should be monitored and appropriate therapy initiated.

Delay in stopping treatment with TRIUMEQ or TRIUMEQ PD or other suspect agents after the onset of hypersensitivity may result in a life-threatening reaction.

Clinically, it is not possible to determine whether a hypersensitivity reaction with TRIUMEQ or TRIUMEQ PD would be caused by abacavir or dolutegravir.

Therefore, never restart TRIUMEQ or TRIUMEQ PD or any other abacavir- or dolutegravir-containing product in patients who have stopped therapy with TRIUMEQ or TRIUMEQ PD due to a hypersensitivity reaction.

5.2 Patients Co-infected with HIV-1 and HBV: Emergence of Lamivudine-Resistant HBV and the Risk of Posttreatment Exacerbations of HBV All patients with HIV-1 should be tested for the presence of HBV prior to or when initiating TRIUMEQ or TRIUMEQ PD.

Emergence of Lamivudine Resistant HBV Safety and efficacy of lamivudine have not been established for treatment of chronic HBV in subjects dually infected with HIV-1 and HBV.

Emergence of HBV variants associated with resistance to lamivudine has been reported in HIV‑1−infected subjects who have received lamivudine‑containing antiretroviral regimens in the presence of concurrent infection with HBV.