Medicines and Alcohol: Which Common Drugs Never Mix

9 min read

Last updated November 10, 2026

Many common medicines should not be mixed with alcohol. Sleep aids, anxiety medicines, opioid pain relievers, some antibiotics and certain diabetes drugs carry some of the biggest risks.

The National Institute on Alcohol Abuse and Alcoholism warns about these mixes. Harm can happen even when you take them hours apart. Effects range from drowsiness to dangerous bleeding or slowed breathing.

With holiday parties ahead, this guide explains which medicines and alcohol do not mix. It also covers who faces the highest risk and how to stay safe.

Health note. This article shares general information, not medical advice. Always read your medicine labels and ask a pharmacist before drinking while taking any medicine.

Key Takeaways

Alcohol can make medicines less effective or more dangerous.
Sleep aids, anxiety medicines and opioids can slow breathing when mixed with alcohol.
Acetaminophen and alcohol together can harm the liver.
Some antibiotics cause nausea, flushing and vomiting with alcohol.
Older adults and women may be more sensitive to these effects.

Jump to a section

Why they interact
Quick reference table
Pain relievers
Sleep and anxiety medicines
Cold and allergy medicines
Antibiotics
Diabetes, heart and mood medicines
Who is at higher risk
When to get help
Frequently asked questions

Why Alcohol and Medicines Interact

NIAAA explains that alcohol can make a medicine less effective or even useless. It can also make some medicines harmful or toxic.

Both alcohol and many medicines are processed by the liver. Combining them can strain the liver or change how fast a medicine leaves your body.

Alcohol also adds to the effects of medicines that cause drowsiness. Two sedating substances together can be far stronger than either one alone.

Timing does not always protect you. Some medicines stay in your body for a day or more, so an evening drink can still interact with a morning dose.

Your age, weight, liver health and other medicines all affect how strong an interaction will be. That is why advice should come from someone who knows your full medicine list.

10 percentHow much alcohol some over-the-counter medicines contain, according to NIAAA.

Quick Reference Table

Medicine type	Examples	Possible effects with alcohol
Sleep aids	Zolpidem, temazepam	Drowsiness, slowed breathing, memory problems
Anxiety medicines	Alprazolam, diazepam	Slowed breathing, impaired coordination
Opioid pain relievers	Prescription opioids	Severe drowsiness, slowed breathing
Acetaminophen	Many pain and cold products	Liver damage
NSAIDs	Ibuprofen, naproxen	Stomach bleeding and ulcers
Antihistamines	Diphenhydramine, loratadine	Drowsiness, dizziness
Some diabetes drugs	Glipizide, glyburide	Low blood sugar, flushing
Blood thinners	Warfarin	Bleeding risk

These examples come from NIAAA. The list is not complete, so check every medicine you take.

Quick tip. Look for an alcohol warning on the Drug Facts label or the pharmacy sticker on your bottle. Ask your pharmacist if you are unsure.

Pain Relievers and Alcohol

MedlinePlus warns not to take acetaminophen if you drink three or more alcoholic drinks every day. Too much acetaminophen can cause liver damage.

NIAAA notes that NSAIDs like ibuprofen and naproxen can cause stomach upset, bleeding and ulcers when combined with alcohol. Opioid pain medicines carry the risk of slowed or difficult breathing.

Compare common options in our guide to acetaminophen vs ibuprofen. People on daily aspirin should also read our guide to daily aspirin.

Sleep and Anxiety Medicines

Sleep aids and anxiety medicines are among the most dangerous to mix with alcohol. NIAAA warns of drowsiness, slowed breathing, impaired motor control and memory problems.

Never drink alcohol with prescription sleep medicines.
Avoid alcohol with benzodiazepines.
Be careful with over-the-counter sleep aids that contain antihistamines.
Do not drive after combining any sedating medicine with alcohol.

Some nerve pain medicines also cause drowsiness. Read our guide to gabapentin side effects for more.

Do you check medicine labels for alcohol warnings?

Always
Sometimes
Never thought about it
Not sure

Cold, Flu and Allergy Medicines

NIAAA says antihistamines can cause drowsiness and dizziness with alcohol and raise overdose risk. This includes many cold and allergy products.

Cough medicines with dextromethorphan or codeine can also cause drowsiness and dizziness. NIAAA notes that some cough syrups have among the highest alcohol content of any medicine.

Learn more in our guides to drowsy vs non-drowsy antihistamines and expectorant vs cough suppressant.

Antibiotics and Alcohol

Most antibiotics do not cause a severe reaction with alcohol, but some do. Metronidazole is one of the best-known examples.

MedlinePlus says not to drink alcohol while taking metronidazole and for at least three days after your final dose. The combination can cause nausea, vomiting, cramps, headache, sweating and flushing.

Alcohol can also slow recovery from any infection. Rest and fluids help more than a drink. Read why antibiotics do not treat colds and flu.

Diabetes, Heart and Mood Medicines

Diabetes Medicines

NIAAA warns that some diabetes medicines, such as glipizide and glyburide, can cause dangerously low blood sugar with alcohol. Learn more about metformin side effects too.

Heart and Blood Pressure Medicines

Medicines for blood pressure and angina can cause dizziness, fainting and an irregular heartbeat with alcohol, according to NIAAA. See our guide to blood pressure medicines.

Blood Thinners

NIAAA says even occasional drinking with warfarin can raise bleeding risk. Talk with your doctor about whether any alcohol is safe for you.

Antidepressants

Many antidepressants can cause drowsiness with alcohol and may worsen depression, NIAAA notes. Read our guide on how SSRI antidepressants work.

Who Is at Higher Risk

NIAAA explains that women generally have less body water than men. The same amount of alcohol becomes more concentrated in their bodies.

Older adults also face higher risk. NIAAA says aging slows the body’s ability to break down alcohol, and older adults often take several medicines.

Older adults
Women
People taking several medicines
People with liver disease
Anyone taking sedating medicines

Hidden Alcohol in Medicines

Some liquid medicines contain alcohol as an ingredient. NIAAA notes that certain products contain up to 10 percent alcohol.

Check the inactive ingredients on liquid cold and cough products. Ask your pharmacist about alcohol-free options if you avoid alcohol completely.

Myths About Medicines and Alcohol

Myth	Fact
Over-the-counter medicines are always safe with alcohol	Many carry alcohol warnings
Waiting a few hours always makes it safe	Some interactions last much longer
One drink cannot cause a problem	Even small amounts can interact with some medicines
Beer and wine are safer than liquor	Alcohol is alcohol, whatever the drink

When in doubt, skip the drink. Your pharmacist can tell you what is safe for your situation.

Free updates

Join the Digieh list

Be the first to know when our weekly brief launches.

No spam. Unsubscribe anytime. Read our Privacy Policy.

Hangovers and Pain Relievers

Many people reach for a pain reliever after a night of drinking. That choice deserves care.

Acetaminophen and alcohol both stress the liver. NSAIDs like ibuprofen can irritate a stomach that is already upset from alcohol.

Drink water and rest instead of reaching for pills first.
Eat a light meal to settle your stomach.
Ask a pharmacist which pain reliever is safest for you.
Avoid taking more than the label allows.

Alcohol and Herbal Supplements

Supplements can interact with alcohol too. NIAAA notes that kava, an herb sometimes used for anxiety, can cause liver damage with alcohol.

Herbal sleep aids and calming products may also add to drowsiness. Tell your pharmacist about every supplement you take.

Driving and Medicines

Many medicines carry warnings about driving or operating machinery. Alcohol makes these effects much stronger.

Never drive after combining alcohol with a sedating medicine.
Plan a safe ride home before a party.
Remember that drowsiness can last into the next morning.
Watch out for friends who mix medicines and alcohol.

Caring for Older Relatives

Older adults often take several medicines and may not realize alcohol can interact. A gentle conversation can prevent problems.

Help them keep an updated medicine list and bring it to the pharmacy. Offer to join them for a medicine review if they would like support. Watch for falls, confusion or extra sleepiness after drinking.

Signs of a Bad Reaction

NIAAA lists several warning signs of a harmful mix. Some appear quickly, while others build over time.

Nausea or vomiting
Headache
Drowsiness or fainting
Loss of coordination
Flushing or a racing heartbeat

Stop drinking and seek help if these symptoms appear. Mild symptoms can quickly become serious with sedating medicines, so do not wait to see if they pass.

If Your Doctor Says Some Alcohol Is Okay

Some medicines allow light drinking. Your doctor or pharmacist can tell you if that applies to you.

Drink slowly and with food.
Alternate alcoholic drinks with water.
Know your limits and stick to them.
Skip alcohol entirely on days you feel unwell.

Remember that medicines and health conditions change over time. Ask again whenever you start a new medicine or your dose changes.

Talking to Your Teen

Teens may not know that cold medicines and alcohol can be dangerous together. A calm talk can prevent a risky mistake.

Explain that mixing alcohol with any medicine can cause serious harm. Keep medicines stored safely at home, and lead by example by checking labels yourself before you drink.

Holiday Party Safety Tips

Check your medicine labels before the party.
Ask your pharmacist if any alcohol is safe with your medicines.
Choose tasty alcohol-free drinks if you are at all unsure.
Never drive after drinking, especially with sedating medicines.
Keep a list of your medicines in your phone.

Festive drinks do not need alcohol. Try our holiday mocktail recipes for tasty options everyone can enjoy.

Questions to Ask Your Pharmacist

Is it safe to drink any alcohol with my medicines?
How long after a dose should I wait before drinking?
Do any of my cold or allergy products contain alcohol?
Could alcohol make my medicine less effective?

Pharmacists can review all your medicines at once. Bring a complete list, including supplements, vitamins and over-the-counter products you use only now and then.

When to Get Help

Trouble breathing or very slow breathing
Extreme drowsiness or trouble staying awake
Confusion or fainting
Vomiting blood or black stools
Signs of very low blood sugar like shaking, sweating or confusion

Call 911 right away for trouble breathing, unresponsiveness or severe symptoms. You can also call Poison Control for advice.

Your Medicine and Alcohol Checklist

Read labels for alcohol warnings
Ask your pharmacist about drinking
Avoid alcohol with sleep and anxiety medicines
Watch acetaminophen and alcohol together
Check liquid medicines for hidden alcohol
Never drive after mixing

Try this today. Check the labels of every medicine in your cabinet for alcohol warnings. Make a note of the ones that say to avoid alcohol.

Test Yourself

How long does MedlinePlus say to avoid alcohol after finishing metronidazole?

At least three days
One hour
No waiting needed

MedlinePlus says to avoid alcohol while taking metronidazole and for at least three days after the final dose.

Frequently Asked Questions

Can I drink alcohol with antibiotics?

It depends on the antibiotic. Some, like metronidazole, should never be mixed.

Is it safe to take acetaminophen after drinking?

Ask your doctor. Heavy drinkers should avoid it because of liver risk.

Can I drink while taking antihistamines?

It can increase drowsiness and dizziness. Avoid it or ask a pharmacist.

How long should I wait to drink after taking medicine?

It varies by medicine. Ask your pharmacist for advice.

Conclusion

Alcohol and medicines can be a risky mix, even with common over-the-counter products. Sleep aids, pain relievers and some antibiotics need special care.

Read labels, ask your pharmacist and choose alcohol-free drinks when in doubt.

Found this useful?