Viagra pill in its packaging. Viagra is the brand name for the drug sildenafil citrate. It is used to treat erectile dysfunction (impotence). Viagra enhances the smooth muscle relaxant effects of nitric oxide,a chemical that is released in response to sexual stimulation. Relaxation of the smooth muscle allows blood to enter the penis,resulting in an erection. Viagra is made at Pfizer Pharamaceuticals | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / CRISTINA PEDRAZZINI |
Bildgröße: | 4222 px × 4147 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: |
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