Drug Interaction Checker

Avoid alcohol-containing drinks while taking medicines that cause drowsiness. Using some of these drugs along with alcohol can lead to serious side effects. You may feel drowsy or more tired when taking these drugs together. Do not drive or operate machinery if you are drinking alcohol-containing beverages. If you notice slurred speech, confusion, severe weakness, or difficulty breathing, contact your health care provider immediately.

Limit caffeine intake (examples: coffee, teas, colas, chocolate and some herbal supplements) while taking Phenylephrine. Also avoid medicines containing additional Caffeine whenever possible. Side effects from Phenylephrine may get worse if you take excessive Caffeine. Taking a high amount of Caffeine can increase the risk of nausea, nervousness, palpitations, problems with sleep, rapid heartbeat, tremor, or other side effects.