Ritonavir tablets are antiviral drugs that can be used clinically alone or in combination with antiretroviral drugs to treat patients with advanced or non-progressive AIDS. Ritonavir is able to bind to the active site of the protease and inhibit its activity blocking the cleavage of viral polymerization proteins, which leads to the formation of immature non-infectious viral particles and achieves antiviral effects. The main adverse reactions include syncope, postural hypotension, dry mouth, cough, dyspepsia, nausea, vomiting, anxiety, fatigue, headache, dizziness, rash and pruritus. Contraindications for ritonavir tablets are: prohibited for those who are allergic to the ingredients; prohibited for nursing mothers, those with severe liver damage. In addition, you should not stop taking it or reduce the dose without a doctor’s examination. If you are not feeling well, you should consult a doctor in time and choose to use the medication under the doctor’s guidance, and you should not abuse the medication by yourself.