Is Valacyclovir Safe To Take With Acetaminophen And Guaifenesin?
In our latest question and answer, Dr. Brian Staiger answers a drug interaction question regarding the drug valacyclovir.
I am on valacyclovir for shingles and I developed a pressure headache. Not sure if it's the drug or the sinus/ear congestion I'm prone to. Can I take acetaminophen or guaifenesin with valacyclovir? (Not Mucinex -- a generic bottle of just guaifenesin.) Any side effects from combining? Thanks!
Dec 25, 2022- Valacyclovir, acetaminophen, and guaifenesin can be safely taken together with no known drug interactions. Headaches are a common side effect of valacyclovir, occurring in just over 11% of people who took it in clinical trials. You can distinguish a sinus headache from other causes by checking if you have pressure in your forehead or cheeks, nasal congestion, or a runny nose along with the pain.
Answer
Thanks for reaching out! There is no known drug interaction between any of the drugs you listed in your question (valacyclovir, acetaminophen, guaifenesin). They are all considered safe to combine.
Now, you mentioned not knowing if the headache you are experiencing is a side effect from valacyclovir (generic for Valtrex), or if you are just coming down with something.
Headaches Are A Common Side Effect Of Acyclovir
It is important to note that experiencing a headache while taking valacyclovir is one of the most common side effects of the drug.
A little over 11% of individuals taking part in clinical trials for the drug experienced a headache. The other most common side effects were nausea, pharyngitis, and diarrhea.
Sinus Headache Or From Acyclovir?
Although it can be tough to tell whether or not a headache is due to sinus pressure or other causes, there are a few common characteristics of sinus headaches to look for:
- Location: A sinus headache is typically characterized by pain and pressure in the forehead, cheeks, or bridge of the nose. A regular headache may be felt in other parts of the head, such as the temples or the back of the head.
- Duration: A sinus headache is usually associated with a sinus infection or other sinus problem and will last as long as the underlying problem exists. A regular headache may be shorter in duration and may resolve on its own.
- Associated symptoms: A sinus headache may be accompanied by other symptoms such as nasal congestion, a runny nose, or a fever. A regular headache may not have any associated symptoms.
Regardless of what is causing your headache, as mentioned, acetaminophen (generic Tylenol) and guaifenesin (generic Mucinex) are safe to take with valacyclovir.
Additionally, if you do think your headache is from a sinus problem, a nasal decongestant may provide you with some benefits as well.
Final Words
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Glossary — Terms in This Answer
- Valacyclovir
- An antiviral medication used to treat infections caused by herpes viruses, including cold sores and shingles.
- Acetaminophen
- A common pain reliever and fever reducer, also known by the brand name Tylenol.
- Guaifenesin
- An expectorant medication that helps thin and clear mucus from the respiratory tract, commonly found in cough medicines like Mucinex.
- Drug interaction
- When two or more medications affect each other in ways that could change how they work or cause harmful effects.
- Pharyngitis
- Inflammation of the throat, commonly known as a sore throat.
- Clinical trials
- Research studies in which people test new or existing medications to evaluate their safety and effectiveness.
- Nasal decongestant
- A medication that reduces swelling and congestion in the nasal passages to help clear the sinuses.
Dr. Brian Staiger, PharmD
Doctor of Pharmacy, board certified clinical pharmacist (BCPS), American Herbalist Guild, Medication Therapy Management certified
Brian Staiger, PharmD, BCPS, is a licensed pharmacist with more than 13 years of experience across retail pharmacy, clinical pharmacy, medication safety, pharmacy program development, and healthcare administration. He is the founder of HelloPharmacist.com, where he helps patients...
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