Valacyclovir and Alcohol: Are They Safe to Take Together?

If your doctor has prescribed valacyclovir (commonly known by the brand name Valtrex^®) you might be curious about whether you can mix valacyclovir and alcohol.

There’s no specific warning against drinking while taking this medication. But it’s always smart to double-check with your doctor to make sure you’re using your medication safely.

Read on to learn more about potential valacyclovir interactions with alcohol. Plus, other safety considerations to keep in mind.

Valacyclovir is a prescription antiviral medication that doctors prescribe to treat:

• Cold Sores (herpes labialis)

• Genital Herpes

• Herpes Zoster, the virus that causes chickenpox and shingles

It helps manage symptoms and speed up healing, but like any medication, it’s important to know how it interacts with other substances — like alcohol.

While the drug label for valacyclovir doesn’t specifically warn against drinking alcoholic beverages, it’s a good idea to consult a healthcare provider before mixing alcohol with any medication.

A 2022 study looked into how alcohol (and even juice!) interacts with antiviral drugs used to treat HIV/AIDS. The verdict? There’s no solid proof that alcohol use impacts effectiveness.

Still, some doctors may advise avoiding alcohol just to be safe.

Here’s why: Your liver processes both valacyclovir and alcohol. Drinking alcohol could, in theory, increase the risk of side effects by making your liver work harder.

But, current clinical trials haven’t shown any direct interactions between alcohol and valacyclovir.

That said, alcohol can negatively impact liver function — and your body overall — so moderation is key.

If you’re taking other medications alongside valacyclovir, ask your doctor or pharmacist about potential interactions.

Cutting back on alcohol could help your body recover faster from infections treated with valacyclovir. Heavy drinking may lead to a weakened immune system and may even promote virus replication.

And the Centers for Disease Control and Prevention (CDC) point out that consuming less alcohol is always better for your health.

The risk of side effects from taking valacyclovir with other medications are low.

So far, no major drug interactions have been reported for valacyclovir.

And while many medications come with a warning to avoid grapefruit (because it interacts with a group of enzymes called cytochrome P450), valacyclovir comes with no grapefruit warning.

Learn more about the potential side effects of valacyclovir.

Do Other Antiviral Medications Interact with Alcohol or Other Drugs?

Always consult your doctor before mixing antivirals with other medications or alcohol. Some antivirals have a low risk of interactions, while others carry a higher risk.

For example, the antiviral zanamivir can interact with live flu vaccines. To stay safe, avoid taking it until two weeks after vaccination.

Most of the potential side effects of valacyclovir are generally mild.

In clinical trials, the most common side effects of valacyclovir — affecting more than 10 percent adults — were:

• Headache

• Nausea

• Abdominal pain

When using Valtrex, it’s important to know about potential serious risks.

Let’s break down the label warnings for valacyclovir:

Blood Disorders (TTP/HUS)

In rare cases, people with HIV or organ transplants taking high doses (8 grams per day) of Valtex experienced thrombocytopenic purpura (TTP) or hemolytic uremic syndrome (HUS).

Risk of Acute Kidney Failure

Acute kidney failure can happen, especially in older adults, those with pre-existing kidney issues, or anyone taking higher-than-recommended doses.

The risk increases if you’re:

• Taking other medications that may impair kidney function

• Not properly hydrated

Central Nervous System Adverse Reactions

Valtex may cause rare but serious side effects on the brain, including:

• Agitation

• Confusion

• Hallucinations

• Delirium

• Seizures

• Encephalopathy (brain dysfunction)

If you experience any unusual symptoms when taking valacyclovir, contact your doctor right away.

Alcohol is a central nervous system depressant, meaning it slows your brain down. Ever felt clumsy or foggy after a few too many? That’s alcohol in action. It can impair your coordination, judgment, and reaction time. Over time, excessive drinking also takes a toll on your body — damaging your liver, kidneys, and other organs.

Excessive alcohol intake contributes to around 178,000 deaths each year in the United States.

If you’re worried about your drinking, don’t wait to get help. A doctor or healthcare professional can guide you toward treatment options and help you develop a treatment plan to cut back. Your loved ones can also help keep you on track and offer support.

Here are some frequently asked questions people have about mixing valacyclovir and alcohol.

What Happens if You Drink Alcohol While Taking Valacyclovir?

Your body uses an enzyme called alcohol dehydrogenase to break down both valacyclovir and alcohol. If you drink heavily, alcohol might slow down how quickly your body processes the medication.

That said, clinical trials have found no major interactions between alcohol and valacyclovir.

Why Should You Drink Plenty of Water While Taking Valacyclovir?

Staying hydrated helps your kidneys process valacyclovir and medications containingacyclovir more efficiently.

Can Alcohol Impact the Effectiveness Of Valacyclovir?

There’s no conclusive evidence that alcohol impacts valacyclovir’s ability to suppress herpes outbreaks and other viral infections. But, heavy drinking might impact your immune health, making it harder for your body to fight off infections.

Doctors commonly prescribe valacyclovir for genital herpes and other viral infections.

While there’s no specific warning against mixing valacyclovir and alcohol, it’s a good idea to be cautious when combining alcohol with any medication.

Let’s recap what we know about valacyclovir and alcohol:

• Alcohol can impact your overall health. Drinking in excess can mess with your immune system and make you more vulnerable to viral infections.

• Alcohol probably doesn’t impact valacyclovir’s effectiveness. It’s likely safe to drink in moderation when taking valacyclovir.

• Valacyclovir can have side effects. Drinking aside, this medication can still cause potential side effects like headaches or nausea. Thankfully, most of the time, they’re mild.

When in doubt, it’s always best to consult with a healthcare professional about the safety of your medications. They can let you know whether it’s safe to take them with alcohol or other medications.