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.