Liquid ritonavir comes with a measuring cup. The liquid version should not be refrigerated. Shake the bottle before taking each dose. Your pharmacist must keep the new ritonavir soft-gel capsules refrigerated. The most serious side effects of ritonavir are nausea, vomiting, gas, and diarrhea.
Some people also experience tingling or numbness around the mouth, or find that foods taste strange.
Side effects made almost one-third of people stop taking ritonavir. For many people, the side effects of ritonavir lasted only 2 to 4 weeks. If they lasted beyond 4 weeks, in most cases they were permanent. Ritonavir is broken down by the liver. It can interact with other drugs that use the liver.