Not a mental drug. but simethicone has virtually no side effects. It relieves gas by lowering the surface tension of the bubbles in your gut (so you can burp th

Not a mental drug. but simethicone has virtually no side effects. It relieves gas by lowering the surface tension of the bubbles in your gut (so you can burp them out easier). But I don't think there's enough evolutionary pressure for Good At Burping to become a favored human trait.