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Acetaminophen, Diphenhydramine, and Phenylephrine
What is it? Overview Usage Side Effects and Warnings
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Acetaminophen, Diphenhydramine, and Phenylephrine Side Effects and Warnings

Written by FoundHealth.

What are the precautions when taking this medicine?

• Avoid other sources of acetaminophen. An overdose may cause dangerous problems.

• This medicine is not for coughs due to smoking or lung disease.

• If you have high blood pressure, talk with healthcare provider.

• If you have liver disease, talk with healthcare provider.

• If you have PKU, talk with healthcare provider. Some products do contain phenylalanine.

• Check medicines with healthcare provider. This medicine may not mix well with other medicines.

• You may not be alert. Avoid driving, doing other tasks or activities until you see how this medicine affects you.

• Avoid alcohol (includes wine, beer, and liquor) or other medicines and natural products that slow your actions and reactions.

• Limit caffeine (for example, tea, coffee, cola) and chocolate intake. Use with this medicine may cause nervousness, shakiness, and fast heartbeat.

• Be careful if you have G6PD deficiency. Anemia may occur.

• Tell healthcare provider if you are pregnant or plan on getting pregnant.

• Tell healthcare provider if you are breast-feeding.

What are some possible side effects of this medicine?

• Feeling lightheaded, sleepy, having blurred vision, or a change in thinking clearly. Avoid driving, doing other tasks or activities that require you to be alert or have clear vision until you see how this medicine affects you.

• Nervous and excitable.

• Dry mouth. Frequent mouth care, sucking hard, sugar-free candy, or chewing sugar-free gum may help.

• Liver damage can rarely occur.

Reasons to call healthcare provider immediately

• If you suspect an overdose, call your local poison control center or emergency department immediately.

• Signs of a life-threatening reaction. These include wheezing; chest tightness; fever; itching; bad cough; blue skin color; fits; or swelling of face, lips, tongue, or throat.

• Chest pain or pressure, fast heartbeat, or passing out.

• Severe headache.

• Yellow skin or eyes.

• Not able to eat.

• Feeling extremely tired or weak.

• Any rash.

• No improvement in condition or feeling worse.

 
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