Viagra absolutely participates. Cocaine causes intense arterial constriction, which impedes blood ejection from the heart. Viagra causes intense venous dilation

Viagra absolutely participates. Cocaine causes intense arterial constriction, which impedes blood ejection from the heart. Viagra causes intense venous dilation, which reduces the amount of blood returning to the heart. This combination is very well-known and pretty lethal. Such cases are seen regularly in the ER. A colleague of mine died of it too.