Caverta 100 mg contains sildenafil, a PDE5 inhibitor used to treat erectile dysfunction (ED). It works by increasing blood flow to the penis when there is sexual stimulation. It does not increase sexual desire and will not normally cause an erection without stimulation. A 100 mg dose is the maximum recommended single dose of sildenafil for most adults, but it may be too high for some people. It should be taken only as directed by a healthcare professional.