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.

If you are a tobacco smoker, use of Acetaminophen can increase the risk of liver side effects. Immediately tell your doctor if you get severe abdominal pain, nausea, vomiting, or yellowing of the skin. Do not exceed 4 g acetaminophen/day in adults. Tell your doctor if Acetaminophen does not help your headache or other pain. Tobacco smoke may reduce the effectiveness of Acetaminophen.

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.

Grapefruit juice may increase the actions of Dextromethorphan. Side effects from the Dextromethorphan may get worse if you drink grapefruit juice. It may be best to avoid drinking grapefruit juice while you are taking Dextromethorphan.