It is more common for shipments that do get through to be detained for several days pending FDA inspection. Other uses for this medicine This medication is sometimes prescribed for other uses; ask your doctor or pharmacist for more information. Sildenafil treats erectile dysfunction by increasing blood flow to the penis during sexual stimulation. Potential for unsupervised use of the medication Labeling and language issues Lack of information related to side effects Required Documentation Always check with the CBP for updated requirements. Although the interaction between other protease inhibitors and sildenafil has not been studied, their concomitant use is expected to increase sildenafil levels. If it is not treated right away, priapism can permanently damage your penis sudden vision loss in one or both eyes.Sildenafil (Viagra) is used to treat erectile dysfunction (impotence; inability to get or keep an erection) in men. Sildenafil (Liqrev, Revatio) is used to improve the ability to exercise in adults (Liqrev, Revatio) and children 1 year of age and older (Revatio) with pulmonary arterial hypertension (PAH; high blood pressure in the vessels carrying blood to the . The generic name for Viagra is sildenafil. The drug also has another brand name: Revatio. It works by slowing down the action of PDE5, an enzyme in the blood vessel walls.. This enzyme breaks down. Examples of Viagra’s more commonly reported side effects include: headache. flushing (temporary warmth, redness, or deepening of skin color) stuffy nose. indigestion (upset stomach) mild vision.