These combinations might use a different amount of ritonavir. Be sure you know how much ritonavir you are supposed to take. During 1998, Abbott Laboratories noticed problems with the original ritonavir capsules. Production was stopped. Everyone taking ritonavir had to take the liquid form.
Many people think the liquid version tastes bad.
However, some people find the liquid more convenient. It will still be available. Liquid ritonavir comes with a measuring cup. The liquid version should not be refrigerated. Shake the bottle before taking each dose.