The Birth of Pharmacology

For old men it is advisable to start the dose of medicine with 50 mg, and if no side effects occur then they can take 100 mg dose next time. Take whole pill of Zenegra, never break, chew, or crush it. Viagra was found to help men achieve and maintain erections by (1) enhancing the effects of the neurotransmitter nitric oxide (NO), and (2) maintaining higher levels of the enzyme cGMP, the two key players in penile erection.

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