Methamphetamine brings on a rapid feeling of exhilaration, a perceived sharpening of focus and heightened sexual desire.
Smoking crystals of methamphetamine causes a rise in body temperature, an increased heart rate and rapid breathing.
Paranoia, short-term memory loss, rages and mood swings have been recorded.
There is anecdotal evidence that use of methamphetamine can cause people to become ill because of HIV more quickly than they would have otherwise, to take more time to recover from infections, and to respond less well to HIV treatment. However, some people believe that this has a lot to do with users of the drug not taking their HIV treatment and other medication properly.
Rapid falls in CD4 cell counts have been observed in methamphetamine users. However, as many users of methamphetamine have difficulty sleeping and/or eating properly, there may be lifestyle factors involved in the quicker disease progression noted in some users.