Can taking too much dextromethorphan cause you to be infertile?

Constipated: At the least you will likely end up very constipated, nauseated, and dopey. If these side effects don't curb your sexual drive, the drug will. If you take a load of it, it will act like heroin. Thus too much will depends on how much. Doubling the usual dose likely will not hurt you and there is no evidence that this affects fertility per se.