A-Bec Abacavir Tablet

Q1: What is Abacavir 300mg (A-Bec) used for?

Abacavir 300mg is an NRTI used as part of combination HIV-1 therapy to suppress viral replication, restore CD4 counts, and prevent progression to AIDS. It is typically combined with other antiretrovirals including lamivudine and an INSTI or NNRTI.

Q2: How does Abacavir prevent HIV from replicating?

Abacavir is phosphorylated inside cells to carbovir triphosphate, which competes with natural dGTP and is incorporated into HIV DNA by reverse transcriptase. The resulting chain termination blocks viral DNA synthesis and prevents new virions from forming.

Q3: What dosing schedule is available for Abacavir 300mg?

Abacavir 300mg can be taken as 300mg twice daily or combined into 600mg once daily dosing. Once-daily dosing simplifies regimens and improves adherence. Never skip or modify doses without your doctor's guidance.

Q4: What is the hypersensitivity reaction and how serious is it?

Abacavir hypersensitivity reaction (HSR) affects 2–8% of patients and is a potentially life-threatening multi-organ response. Symptoms include fever, rash, nausea, vomiting, abdominal pain, and malaise typically occurring within the first 6 weeks. Stop Abacavir immediately and never rechallenge — rechallenging can cause fatal hypotension.

Q5: What is HLA-B*5701 screening and why is it required?

HLA-B*5701 is a genetic variant that predicts Abacavir hypersensitivity. All patients must be tested before starting Abacavir — if positive, Abacavir must not be used. This screening has nearly eliminated severe HSR in screened populations.

Q6: Can Abacavir be taken with food?

Yes, Abacavir can be taken with or without food. Food does not significantly affect its absorption. Consistent timing at the same time each day is more important than meal timing.

Q7: What are the most common side effects of Abacavir?

Common side effects include nausea, diarrhea, headache, fatigue, and loss of appetite — particularly in the first few weeks. These usually improve with continued treatment.

Q8: What serious side effects beyond HSR require monitoring?

Lactic acidosis (muscle pain, weakness, breathing difficulty — rare but serious), hepatotoxicity (jaundice, dark urine, abdominal pain), and pancreatitis. Monitor liver function at baseline and regularly during therapy.

Q9: Does Abacavir have cardiovascular risks?

Some studies suggest Abacavir may be associated with increased cardiovascular risk, particularly in patients with pre-existing heart disease. Discuss with your HIV specialist if you have cardiovascular risk factors.

Q10: Can I take Abacavir during pregnancy?

Abacavir is used in pregnancy when the benefit outweighs the risk. It is included in some WHO-recommended regimens for pregnant women with HIV. Discuss with your HIV specialist and obstetric team.

Q11: How should Abacavir 300mg be stored?

Store at room temperature away from light and moisture. Keep out of reach of children. Do not use after the expiry date.

Q12: Do I need a prescription for Abacavir?

Yes. Abacavir is a prescription-only antiretroviral. A specialist must confirm HLA-B*5701 status, assess your overall HIV regimen, and monitor for hypersensitivity before and during treatment.