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Короче, я сам загуглил:
Viagra and Ecstasy

The interaction between MDMA (Ecstasy) and the Viagra-type medicines (PDE5 inhibitors) is less well understood. Although there are no documented adverse outcomes there are theoretical issues. MDMA stimulates the cardiovascular system: increasing heart rate, blood pressure, and body temperature. Viagra (sildenafil) type drugs are vasodilators, which has the opposite effect on blood pressure. The heart beats faster in response in an attempt to normalise the blood pressure. Rather than cancelling each other out, the effects of both could cause a dangerously high pulse rate, especially in someone with pre-existing heart disease.

Another possible interaction between MDMA and PDE5 inhibitors could be beneficial. Spanish research in 2011 demonstrated that giving Sildenafil (generic Viagra) twenty-four hours prior to high, usually neurotoxic doses of MDMA, reduced the damage to the rats’ brains. The authors write: “Our findings indicate that sildenafil afforded significant protection against MDMA-induced 5-HT.” Of course humans are not rats and the doses of MDMA were much higher than those commonly used by people. Whether taking an ED medication alongside MDMA would decrease neurological symptoms such as tiredness or low mood is not known, nor is it advisable to try.

Вкратце: в теории мдма и виагра действуют в разные стороны на сердце и по идее должны компенсировать друг друга, но может возникнуть и проблема. Исследований нет
С другой стороны, есть ислледования, что виагра снижает серотониновый синдром, что конечно же большой плюс

Поэтому вопрос в силе, хочу услышать опыт анонов в этом деле, кам он