Store mixed oral liquid in the refrigerator. Check with your doctor immediately if any of the following side effects occur: Less common burning feeling in the chest or stomach burning, crawling, itching, numbness, prickling, “pins and needles”, or tingling feelings cloudy or bloody urine. If you experience a prolonged or painful erection for 4 hours or more, contact your doctor immediately. Small case studies in pregnant women with PAH indicate a low risk of harm, though caution is warranted. Ask your doctor if you have any questions.For daily use, Goldstein said, the generic form, sildenafil, comes in mg tablets. “We prescribe one mg tablet a night, a classic dose,” he said. “Should they wish to have sex, they. Price Sold Revenue; $ $5, $ $4, $ $4, $ $2, $ $3,  · Maximum dose: 20 mg orally three times a day. Injection: Initial dose: or 10 mg IV bolus three times a day. Comments: No greater efficacy was achieved with oral doses higher than the maximum recommended dose. A 10 mg injection dose is predicted to provide pharmacological effect equivalent to the 20 mg oral dose.