From nausea to rashes to drowsiness, most medications can cause side effects. For some common prescriptions, that can mean screwing with your erection, your <a href="https://www.menshealth.com/sex-women/a19545085/make-orgasms-even-better/" id="9555276a-1d1f-3728-a505-bfaa88c0965b"> orgasm </a> , and your sex drive.