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What is this medication? 

Efavirenz, Sustiva
Antiretroviral, Reverse Transcriptase Inhibitor, Non-nucleoside (Anti-HIV)

Efavirenz, Sustiva is indicated for treatment of HIV-1 Infection

How does this medication work? 

Efavirenz, Sustiva is a reverse transcriptase inhibitor which has activity against HIV-1 efavirenz has activity against HIV-1 by binding to reverse transcriptase. It consequently blocks the RNA-dependent and DNA-dependent DNA polymerase activities including HIV-1 replication.

How should I take this medication? 

Oral: 600mg once daily.

Administer on an empty stomach.  Dosing at bedtime. Swallow the tablet and/or capsule whole.  The contents of the capsule can be sprinkled over food and administered within 30 minutes of mixing.

What should I watch for while using this medication? 

Before starting Efavirenz, Sustiva make sure your physician is aware of any allergies or medications you currently take.  Efavirenz, Sustiva may cause central nervous system (i.e. dizziness, insomnia, hallucinations, drowsiness), fat distribution, hepatotoxicity, hypercholesterolemia, immune reconstitution syndrome, psychiatric effects, rash, QT prolongation, seizure disorder.

What if I miss a dose?

If you miss a dose of medication, try to take it as soon as possible. However, if it is almost time for your next dose, take only that scheduled dose. Do not take double or extra doses.

How should I store this medication?

Keep out of the reach of children at all times. Store at room temperature, 59 to 86° F (15 to 30° C). Protect from light. Keep the container tightly closed. Properly dispose of any unused medication after the expiration date.

What are the possible side effects of using this medication?

Skin rash, diarrhea, central nervous system toxicity, diarrhea, pruritis, erythema multiforme.

Note this is not a complete list of side effects, only common ones.