AZT is a nucleoside reverse transcriptase inhibitor.
Today, the customary dose is either 3 capsules twice a day or 2 capsules three times a day. There are several good reasons to adjust the usual dose -- make sure you go to a doctor who specializes in HIV Disease.
AZT is fairly easy to take, but a small percentage of people feel side-effects. The most dangerous is severe anemia, but that's fairly rare. Other possible side effects include headache and muscle loss.
Taking AZT alone (called "monotherapy") can let HIV mutate into a strain that is resistant to the drug. Today, AZT is most commonly used with one or two other drugs.
In the movie, Rent, AZT could not help Angel with his AIDs