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Effects of Viagra on Blood Pressure When Co-administered with Alpha-Blockers: Three double-blind, placebo-controlled, randomized, two-way crossover studies were conducted to assess the interaction of Viagra with doxazosin, an alpha-adrenergic blocking agent.Manufactured for: buy cialis canada (tadalafil) tabletsViagra should not be used in women.

Contact your doctor or seek emergency medical attention if your erection is painful or lasts longer than 4 hours. A prolonged erection (priapism) can damage the penis.5. Israilov S, Baniel J, Shmueli J, et al. "Treatment program for erectile dysfunction in patients with cardiovascular diseases." Am J Cardiol 93 (2004): 689-93

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