The trip effects of Melmac are generally the same as for any other psilocybin mushroom. That is, there is an exaggeration or enhancement of whatever mood the user has going in (hopefully this will mean euphoria and a sense of connection, as it often does), plus altered thinking that can lead to important personal insights, and hallucinations—the hallucinations are likely to be subtle, except at high doses, and may be absent at very low doses. Unpleasant side effects, such as nausea, vomiting, and excessive yawning, are not uncommon. More serious side effects, such as debilitating anxiety and problems with balance and coordination are less common but real. Really serious problems are rare but possible.
The risk of serious side effects can be minimized by practicing a few safety guidelines, such as careful attention to set and setting, having a trip-sitter, making sure you’re healthy enough for the trip and are not taking any medications that could interact badly with psilocybin, and taking adequate time afterwards for integration.