Can You Overdose on Naproxen? Signs and What to Do

Naproxen, sold over the counter as Aleve, can be overdosed, but most overdoses cause only stomach upset and mild nervous-system symptoms such as drowsiness. Very large amounts can cause seizures, coma, bleeding, and kidney failure.1Poison Control. Naproxen: Side effects and overdose concerns Compared with acetaminophen (Tylenol), it causes far fewer serious overdoses.2Taylor & Francis Online / Postgraduate Medicine. Gastrointestinal safety and tolerability of oral non-aspirin over-the-counter analgesics The amount taken, and the health of the person who took it, decide how worried to be, and anyone who has gone over the label should call Poison Control.

How Much Naproxen Is Too Much

Over-the-counter tablets contain 220 mg, and labels allow up to 3 tablets in 24 hours for adults. At those doses it is well tolerated. In short-term studies, people taking naproxen at normal doses had side effects about as often as people taking a dummy pill.3PubMed. Safety of naproxen compared with placebo, ibuprofen and acetaminophen: a pooled analysis of eight multiple-dose, short-term, randomized controlled studies Serious stomach bleeding and ulcers are uncommon at over-the-counter doses.4Taylor & Francis Online / Postgraduate Medicine. Gastrointestinal safety and tolerability of oral non-aspirin over-the-counter analgesics

Severe poisoning takes far more. Dangerous acid buildup has been reported after swallowing roughly 20 to 70 grams at once, about 90 to 300 store tablets.5PubMed Central. Intentional Naproxen Overdose Causing Metabolic Acidosis: A Case Report Above about 500 mg in one dose, the body starts clearing more of the drug through the kidneys, so blood levels rise more slowly than the dose.6Clinical Pharmacokinetics. Clinical Pharmacokinetics of Naproxen That cushion has limits. In one case, a man who swallowed 70 grams with alcohol had blood levels about 20 times the normal range and had seizures within 4 hours.7PubMed Central. Massive Naproxen Overdose with Serial Serum Levels

Most real-world excess is far more modest: someone takes a fourth tablet in a day, or takes a second dose a few hours early because the pain came back. One or two extra tablets usually cause nothing worse than heartburn or an upset stomach. Repeated days of excess are a different situation, with higher odds of stomach and kidney trouble. The risk climbs with every extra tablet, especially if they are taken all at once, and there is no single cutoff between safe and dangerous. If you’ve gone over the label even once, stop taking more and call Poison Control to ask whether anything else is needed.

The same number of tablets means different things for different people. A few adult tablets are a much bigger dose for a small child, because the drug is spread across far less body weight. Poison Control judges risk by milligrams per kilogram, so for a child they will usually want the weight and the number of tablets. An older adult or someone with kidney problems can also react badly to a smaller extra amount, because the kidneys are less able to handle the drug and its effects on blood flow.

Check for hidden naproxen, too. Some cold, sinus, and sleep products contain naproxen sodium alongside other drugs, so taking Aleve plus one of them can double the dose without you realizing it. Read the active ingredient line on every box before adding another pill.

Signs of a Naproxen Overdose

Milder signs are the most common:

Signs of serious poisoning are different:

The stomach is hit first because naproxen lowers the protective mucus and blood flow in the stomach lining while increasing acid.18PubMed Central. The patterns of toxicity and management of acute nonsteroidal anti-inflammatory drug (NSAID) overdose It also directly damages the lining.19PubMed Central. The patterns of toxicity and management of acute nonsteroidal anti-inflammatory drug (NSAID) overdose

Ordinary upset from naproxen means nausea or a burning pain. Bleeding looks different: black, tarry stools that are sticky and have a strong, unusual smell, or vomit that looks like coffee grounds or has red blood in it. Dizziness, fainting, or unusual paleness along with stomach pain can mean the body is losing blood. Any of these needs 911 or an emergency room right away, not a wait-and-see approach.

Kidney trouble can show up over the next days rather than hours. Passing much less urine than usual is a warning sign. So is swelling of the feet, ankles, or face from fluid retention. Unusual tiredness or nausea that lasts past the first day deserves a check.

What to Do Right Now

In the US, Poison Control is free and open 24 hours at 1-800-222-1222, or online at poison.org. For a mild or uncertain overdose, they can tell you whether watching at home is enough. Call 911 right away if the person is having a seizure, is hard to wake, is confused, or is vomiting blood. Don’t make the person vomit unless a professional tells you to.

Have a few things ready for the call. Grab the bottle first, so you can read out the product name and the strength of each tablet, such as 220 mg. Estimate how many tablets are missing and what time they were taken, since timing affects how worried the experts will be. Be ready to give the person’s age, weight, and any other medicines they take, including blood pressure pills. Say whether alcohol or any other drug was involved, because it changes the advice.

If you’re told it’s safe to watch at home, give the stomach a rest and avoid more anti-inflammatory pain relievers like ibuprofen or aspirin. If pain relief is needed and advised, use acetaminophen only at label doses. Call back if new symptoms appear in the hours or days after, and keep the person company in case drowsiness gets worse.

Treat any deliberate overdose as an emergency regardless of tablet count. In the US, call or text 988 for the Suicide and Crisis Lifeline. Stay with the person and move other medicines out of reach.

Who Is at Higher Risk

The kidneys are the main concern. Naproxen blocks chemicals the kidneys use to keep their blood vessels open, so blood flow to them can drop sharply and damage them.20Archives of Nephrology and Renal Studies. NSAID-associated Renal Injury: Mechanisms, Risks, and Safer Strategies The good news is that kidney failure from naproxen is usually reversible.21Poison Control. Naproxen: Side effects and overdose concerns It is more likely, though, in older adults and in people with diabetes or existing kidney disease.22Poison Control. Naproxen: Side effects and overdose concerns Risk is also higher with heart or liver failure, or with water pills and certain blood pressure medicines.23Archives of Nephrology and Renal Studies. NSAID-associated Renal Injury: Mechanisms, Risks, and Safer Strategies

Those medicines matter for specific reasons. Water pills lower the fluid in the body, which already reduces blood flow to the kidneys. ACE inhibitors and ARBs, such as lisinopril and losartan, change blood flow within the kidneys, so adding naproxen on top makes injury more likely. Anyone taking these should mention them when calling Poison Control, since it changes how closely they need to be watched.

The stomach is the other weak point. People with past ulcers or stomach bleeding are at higher risk.24Better Days Treatment Center. Naproxen and Alcohol: Risks, Safety Tips, and When to Get Help Naproxen can also upset salt and potassium levels in the blood within a day or two of a large dose.25Archives of Nephrology and Renal Studies. NSAID-associated Renal Injury: Mechanisms, Risks, and Safer Strategies

Older relatives deserve extra attention when they take pills for pain. They may space doses too close together or forget a dose was already taken. A pill organizer or written log helps prevent repeats, and a doctor can say whether naproxen is right for someone with kidney concerns.

Alcohol and Other Drugs That Make It Worse

Combining naproxen with alcohol or other drugs can increase its harm.26icliniq. How should The Management of a Naproxen Overdose Poisoning be Handled? Stomach bleeding risk rises further with alcohol, steroid pills, blood thinners, and antidepressants such as sertraline or fluoxetine.27PubMed Central. Adverse drug reactions and drug–drug interactions with over-the-counter NSAIDs Someone on a blood thinner who overdoses should be seen urgently.

Even at label doses, heavy drinking raises stomach irritation, and spacing alcohol away from the dose does not remove the risk. People who drink daily should ask a doctor about safer pain options.

If acetaminophen was also taken, it brings its own risk of serious liver damage that needs separate attention. Tell Poison Control and emergency staff about everything swallowed, including alcohol and supplements, so nothing is missed.

What Happens at the Hospital

There is no standard antidote for naproxen.28PubMed. Bilirubin Elevation Caused by Naproxen Overdose: A Case Report Highlighting Laboratory Interference Activated charcoal, a drink that can bind drugs in the gut, may be offered, though how much it helps is unclear.29PubMed. Bilirubin Elevation Caused by Naproxen Overdose: A Case Report Highlighting Laboratory Interference Ordinary dialysis removes little naproxen because it sticks tightly to proteins in the blood.30PubMed. Bilirubin Elevation Caused by Naproxen Overdose: A Case Report Highlighting Laboratory Interference Dialysis may still be used to correct severe acid buildup or kidney failure.31PubMed Central. Massive Naproxen Overdose with Serial Serum Levels

In the emergency room, staff will ask what was taken, how much, and exactly when, since the timing helps them judge how much drug is in the body. Blood tests check kidney function, salt and potassium levels, and acid levels. Fluids through an IV support the kidneys and keep blood flowing to them. Medicine to protect the stomach may be given if there is pain or bleeding.

Most people with mild overdoses go home the same day. Kidney tests may be repeated over the following days. Ask before taking any anti-inflammatory pain reliever again.

If Your Dog Ate Naproxen

Dogs handle naproxen very differently. People clear it through urine, but dogs recycle it through the gut.32dvm360. Toxicology Brief: Naproxen toxicosis in dogs It stays in a dog’s body far longer, with a half-life of about 74 hours.33dvm360. Toxicology Brief: Naproxen toxicosis in dogs Naproxen can cause worse illness at lower doses in dogs than many other pain pills.34PubMed Central. Treatment of a massive naproxen overdose with therapeutic plasma exchange in a dog

Because it lingers and keeps irritating the body, a single tablet can be enough to harm a small dog, so don’t wait for symptoms before acting. The main targets are the stomach, where ulcers and bleeding can develop, and the kidneys.

Call your vet or an animal poison hotline, such as the ASPCA Animal Poison Control at 888-426-4435, right away. Have the tablet strength, how many may be missing, and your dog’s weight ready. Don’t try to make your dog vomit unless a vet tells you to, since the right step depends on timing and the dog. Watch for vomiting, black stools, or reduced drinking and urination, and never give a dog human pain relievers.

Preventing an Accidental Overdose

Naproxen doses are spaced 8 to 12 hours apart, and taking another dose early because pain returns is a common way to exceed the limit. Store pills locked or high, since child-resistant caps slow children down but don’t stop them.

Taking naproxen with ibuprofen or aspirin adds to the stomach and kidney risk. Acetaminophen works differently, but it has its own daily limit, so it needs tracking too. When several people give medicine to the same person, a shared written log with times keeps doses from overlapping.

Pain that needs naproxen for more than 10 days calls for a checkup. Ongoing heartburn or stomach pain while on naproxen should be reported, and anyone taking it long term can ask about kidney checks.