stiffness, sweating, fast or irregular heartbeats, feeling like you might pass out; nausea, vomiting, stomach pain, loss of coordination; fainting or seizure medication such as atazanavir (Reyataz), delavirdine (Rescriptor), efavirenz (Sustiva, Atripla), indinavir (Crixivan), ritonavir (Norvir, Kaletra), saquinavir (Invirase), or ritonavir (Norvir, Kaletra), saquinavir (Invirase), and HIV/AIDS