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Spring RM, Ulrich S, Huber LC, Speich R, Maggiorini M, Treder U, Fischler M. Sildenafil for pulmonary hypertension: dose-dependent improvement in exercise performance. Pulm Pharmacol Ther. 2008;21(3):516-21.

If one drug doesnât work or produces unpleasant side effects, you can try another drug. It may also take some trial and error to find the dosage that works best for you. And if youâre not sure that drug treatment is right for you, you can give these natural treatments for erectile dysfunction a try.

Another brand of sildenafil is Revatio, which is used to treat pulmonary arterial hypertension and improve exercise capacity in men and women. Do not take Viagra while also taking Revatio, unless your doctor tells you to.]