Most people who take phenylephrine HCl will not experience any problems. However, side effects are possible and may include things such as headaches, dizziness, and insomnia. In most cases, side effects are minor and are easily treated. In some cases, however, people may experience potentially serious side effects that require immediate medical care. Notify your healthcare provider right away if you develop serious side effects of phenylephrine HCl, such as chest pain, a slow heart rate, or decreased urine production.
(Click Phenylephrine Side Effects for a more in-depth look at possible phenylephrine HCl side effects, including some of the potentially serious side effects of the medication that require prompt medical care. You can also click any of the links in the box to the right for specific information.)