Skip to Content

Theraflu Severe Cold and Cough

Generic Name: Acetaminophen, Dextromethorphan, Phenylephrine, and Diphenhydramine (a SEET a MIN oh fen/DEX troe meth OR fan/DYE fen HYE dra meen/FEN il EF rin)
Brand Name: Theraflu Severe Cold and Cough

Medically reviewed on September 5, 2018

Uses of Theraflu Severe Cold and Cough:

  • It is used to treat nose stuffiness.
  • It is used to ease allergy signs.
  • It is used to relieve coughing.
  • It is used to ease pain and fever.

What do I need to tell my doctor BEFORE I take Theraflu Severe Cold and Cough?

  • If you have an allergy to Theraflu Severe Cold and Cough (acetaminophen, dextromethorphan, phenylephrine, and diphenhydramine) or any part of Theraflu Severe Cold and Cough (acetaminophen, dextromethorphan, phenylephrine, and diphenhydramine).
  • If you are allergic to any drugs like this one, any other drugs, foods, or other substances. Tell your doctor about the allergy and what signs you had, like rash; hives; itching; shortness of breath; wheezing; cough; swelling of face, lips, tongue, or throat; or any other signs.
  • If you have taken certain drugs used for low mood (depression) like isocarboxazid, phenelzine, or tranylcypromine or drugs used for Parkinson's disease like selegiline or rasagiline in the last 14 days. Taking Theraflu Severe Cold and Cough (acetaminophen, dextromethorphan, phenylephrine, and diphenhydramine) within 14 days of those drugs can cause very bad high blood pressure.
  • If you are taking any of these drugs: Linezolid or methylene blue.
  • If you have a cough with a lot of mucous.
  • If you have a long-term cough caused by smoking or being around smoke, or lung problems like asthma or emphysema.
  • If you have liver disease.

This is not a list of all drugs or health problems that interact with Theraflu Severe Cold and Cough (acetaminophen, dextromethorphan, phenylephrine, and diphenhydramine).

Tell your doctor and pharmacist about all of your drugs (prescription or OTC, natural products, vitamins) and health problems. You must check to make sure that it is safe for you to take Theraflu Severe Cold and Cough (acetaminophen, dextromethorphan, phenylephrine, and diphenhydramine) with all of your drugs and health problems. Do not start, stop, or change the dose of any drug without checking with your doctor.

What are some things I need to know or do while I take Theraflu Severe Cold and Cough?

  • Tell all of your health care providers that you take Theraflu Severe Cold and Cough (acetaminophen, dextromethorphan, phenylephrine, and diphenhydramine). This includes your doctors, nurses, pharmacists, and dentists.
  • Do not take more than what your doctor told you to take. Taking more than you are told may raise your chance of very bad side effects.
  • Do not take Theraflu Severe Cold and Cough (acetaminophen, dextromethorphan, phenylephrine, and diphenhydramine) for longer than you were told by your doctor.
  • Avoid driving and doing other tasks or actions that call for you to be alert until you see how Theraflu Severe Cold and Cough (acetaminophen, dextromethorphan, phenylephrine, and diphenhydramine) affects you.
  • Avoid drinking alcohol while taking Theraflu Severe Cold and Cough (acetaminophen, dextromethorphan, phenylephrine, and diphenhydramine).
  • Talk with your doctor before you use other drugs and natural products that slow your actions.
  • Do not use with other products that have diphenhydramine.
  • Avoid other sources of acetaminophen. Check labels closely. Too much acetaminophen may cause problems.
  • This medicine has acetaminophen in it. Very bad and sometimes deadly liver problems like the need for a liver transplant have happened with acetaminophen use. Most of the time, liver problems have happened in people taking more than 4,000 milligrams of acetaminophen in a day. Also, people who had liver problems were often using more than 1 drug that had acetaminophen in it. Talk with your doctor.
  • Call your doctor right away if you take more than 4,000 mg (milligrams) of acetaminophen in a day, even if you feel well.
  • If you have phenylketonuria (PKU), talk with your doctor. Some products have phenylalanine.
  • If you are taking warfarin, talk with your doctor. You may need to have your blood work checked more closely while you are taking it with Theraflu Severe Cold and Cough (acetaminophen, dextromethorphan, phenylephrine, and diphenhydramine).
  • This medicine may affect certain lab tests. Tell all of your health care providers and lab workers that you take Theraflu Severe Cold and Cough (acetaminophen, dextromethorphan, phenylephrine, and diphenhydramine).
  • Use with care in children. Talk with the doctor.
  • Different brands of Theraflu Severe Cold and Cough (acetaminophen, dextromethorphan, phenylephrine, and diphenhydramine) may be for use in different ages of children. Talk with the doctor before giving Theraflu Severe Cold and Cough (acetaminophen, dextromethorphan, phenylephrine, and diphenhydramine) to a child.
  • Tell your doctor if you are pregnant or plan on getting pregnant. You will need to talk about the benefits and risks of using Theraflu Severe Cold and Cough (acetaminophen, dextromethorphan, phenylephrine, and diphenhydramine) while you are pregnant.
  • Tell your doctor if you are breast-feeding. You will need to talk about any risks to your baby.

How is this medicine (Theraflu Severe Cold and Cough) best taken?

Use Theraflu Severe Cold and Cough (acetaminophen, dextromethorphan, phenylephrine, and diphenhydramine) as ordered by your doctor. Read all information given to you. Follow all instructions closely.

  • Take with or without food. Take with food if it causes an upset stomach.
  • Melt 1 packet in hot water. Sip while hot.
  • If using a microwave, melt 1 packet in cool water. Microwave until hot. Do not overheat. Stir before and after heating.

What do I do if I miss a dose?

  • If you take Theraflu Severe Cold and Cough (acetaminophen, dextromethorphan, phenylephrine, and diphenhydramine) on a regular basis, take a missed dose as soon as you think about it.
  • If it is close to the time for your next dose, skip the missed dose and go back to your normal time.
  • Do not take 2 doses at the same time or extra doses.
  • Many times Theraflu Severe Cold and Cough (acetaminophen, dextromethorphan, phenylephrine, and diphenhydramine) is taken on an as needed basis. Do not take more often than told by the doctor.

What are some side effects that I need to call my doctor about right away?

WARNING/CAUTION: Even though it may be rare, some people may have very bad and sometimes deadly side effects when taking a drug. Tell your doctor or get medical help right away if you have any of the following signs or symptoms that may be related to a very bad side effect:

  • Signs of an allergic reaction, like rash; hives; itching; red, swollen, blistered, or peeling skin with or without fever; wheezing; tightness in the chest or throat; trouble breathing, swallowing, or talking; unusual hoarseness; or swelling of the mouth, face, lips, tongue, or throat.
  • Signs of liver problems like dark urine, feeling tired, not hungry, upset stomach or stomach pain, light-colored stools, throwing up, or yellow skin or eyes.
  • Not able to pass urine or change in how much urine is passed.
  • A very bad skin reaction (Stevens-Johnson syndrome/toxic epidermal necrolysis) may happen. It can cause very bad health problems that may not go away, and sometimes death. Get medical help right away if you have signs like red, swollen, blistered, or peeling skin (with or without fever); red or irritated eyes; or sores in your mouth, throat, nose, or eyes.

What are some other side effects of Theraflu Severe Cold and Cough?

All drugs may cause side effects. However, many people have no side effects or only have minor side effects. Call your doctor or get medical help if any of these side effects or any other side effects bother you or do not go away:

  • Dizziness.
  • Feeling nervous and excitable.
  • Not able to sleep.
  • Feeling sleepy.

These are not all of the side effects that may occur. If you have questions about side effects, call your doctor. Call your doctor for medical advice about side effects.

You may report side effects to the FDA at 1-800-FDA-1088. You may also report side effects at http://www.fda.gov/medwatch.

See also: Side effects (in more detail)

If OVERDOSE is suspected:

If you think there has been an overdose, call your poison control center or get medical care right away. Be ready to tell or show what was taken, how much, and when it happened.

How do I store and/or throw out Theraflu Severe Cold and Cough?

  • Store at room temperature.
  • Protect from heat.
  • Store in a dry place. Do not store in a bathroom.
  • Keep all drugs in a safe place. Keep all drugs out of the reach of children and pets.
  • Throw away unused or expired drugs. Do not flush down a toilet or pour down a drain unless you are told to do so. Check with your pharmacist if you have questions about the best way to throw out drugs. There may be drug take-back programs in your area.

Consumer information use

  • If your symptoms or health problems do not get better or if they become worse, call your doctor.
  • Do not share your drugs with others and do not take anyone else's drugs.
  • Keep a list of all your drugs (prescription, natural products, vitamins, OTC) with you. Give this list to your doctor.
  • Talk with the doctor before starting any new drug, including prescription or OTC, natural products, or vitamins.
  • Some drugs may have another patient information leaflet. Check with your pharmacist. If you have any questions about Theraflu Severe Cold and Cough (acetaminophen, dextromethorphan, phenylephrine, and diphenhydramine), please talk with your doctor, nurse, pharmacist, or other health care provider.
  • If you think there has been an overdose, call your poison control center or get medical care right away. Be ready to tell or show what was taken, how much, and when it happened.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Hide