Caverta is a prescription medicine containing sildenafil citrate, a PDE5 inhibitor commonly used to treat erectile dysfunction in men. It works by helping increase blood flow to the penis during sexual stimulation, supporting the natural process of achieving and maintaining an erection. Caverta does not increase sexual desire and requires sexual arousal to work. The medicine should be used only as directed by a qualified healthcare professional. Common side effects may include headache, flushing, indigestion, dizziness, and nasal congestion. Caverta should not be combined with nitrate medicines because the combination can cause a dangerous drop in blood pressure. Consult a healthcare professional before use, particularly if you have cardiovascular conditions or take other medicines.