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"No in-vivo studies in an animal model have been performed at this regard, so a lot of work must be done. We would like to test in vivo [with animals] the molecule to understand if it really works in humans," said study lead author Mario Dell'Agli, of the University of Milan's laboratory of pharmacognosy. "At this stage of the research, we cannot say if the molecule we have synthesized possesses less side effects with respect to Viagra. However, this derivative seems to be in vitro [in lab tests] more selective than Viagra, because it targets [an enzyme involved in blood flow to the penis] more precisely." McCullough adds, "If you put it in the context of a physical problem and not a sexual one, most men will be less likely to 'shut down' or shut you out." While some men would rather go the treatment route alone, others might welcome the support of their partner, so be certain to make the offer to go with him, and then let your man decide. Monitoring erections that occur during sleep (nocturnal penile tumescence) can help distinguish between erectile dysfunction of psychological and physical causes. If nocturnal erections do not occur, then the cause of erectile dysfunction is likely to be physical rather than psychological, however, tests of nocturnal erections are not completely reliable. Scientists have not standardized the tests and have not determined in whom they should be done. buy Viagra 25mg here canadian viagra for sale

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