Like other drugs for HIV, Efavir works by impairing the virus's ability to multiply. However, when taken alone it may prompt the virus to become resistant. Efavir is therefore always taken with at least one other HIV medication, such as Retrovir or Crixivan. Even when used properly, it may remain effective for only a limited time.

Medication/Labelled/Produced by	Strength/Quantity	Price	Freedom Pharmacy
EFAVIR/Generic Sustiva, Efavirenz / Cipla Limited	200mg 60 Capsules	$114.21
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EFAVIR/Generic Sustiva, Efavirenz / Cipla Limited	600mg 30 Capsules	$159.47
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