Ritonavir may cause side effects. Tell your doctor if any of these symptoms are severe or do not go away:
drowsiness
diarrhea
gas
heartburn
change in ability to taste food
headache
numbness, burning, or tingling of the hands, feet, or area around the mouth
muscle or joint pain
stomach pain, nausea, and vomiting
Some side effects can be serious. If you experience any of the following symptoms, call your doctor immediately or get emergency medical treatment:
blistering or peeling of the skin
rash
hives
swelling of the eyes, face, tongue, lips, or throat
tightening of the throat
difficulty breathing or swallowing
nausea
vomiting
stomach pain
excessive tiredness
lack of energy
loss of appetite
pain in the upper right part of the stomach
yellowing of the skin or eyes
dizziness
lightheadedness
loss of consciousness
irregular heartbeat