The standard dose for chewable Pepto-Bismol tablets
The label on chewable Pepto-Bismol tablets tells you to take two tablets every 30 minutes to one hour, up to eight times in a 24-hour period. That means the maximum is 16 tablets per day for adults and children 12 and older. Do not exceed this limit without talking to a doctor or pharmacist first.
The active ingredient in Pepto-Bismol is bismuth subsalicylate. Each chewable tablet usually contains 262 mg. The 16-tablet daily limit exists because taking more than the recommended amount can cause side effects, some of which are serious.
Children under 12 should not take Pepto-Bismol without a doctor's instruction. If your child has diarrhea or stomach upset, call your pediatrician before giving any over-the-counter medication.
Key Takeaways
- The maximum dose is two tablets every 30 minutes to one hour, up to eight times daily, which equals 16 tablets in 24 hours for adults and children 12 and older.
- Do not take Pepto-Bismol for more than two days without talking to a doctor, because longer use can mask a serious condition.
- Bismuth subsalicylate can interact with blood thinners, aspirin, and certain antibiotics, so tell your doctor or pharmacist about all medications you take.
- Stop taking Pepto-Bismol and call a doctor if you see black stools, ringing in your ears, or severe stomach pain.
Why there is a daily limit
Bismuth subsalicylate is a salicylate, which means it is chemically related to aspirin. Taking too much can cause salicylate toxicity, a condition where the chemical builds up in your body and damages your kidneys and nervous system. Symptoms include ringing in the ears, confusion, rapid breathing, and severe headache.
The daily limit also prevents bismuth from accumulating in your tissues over time. Bismuth is a heavy metal, and your body eliminates it slowly. Staying within the recommended dose keeps the amount in your system at a safe level.
If you have taken more than 16 tablets in 24 hours by accident, do not panic. Call Poison Control at 1-800-222-1222 (available 24 hours, free, confidential). They can tell you whether you need medical attention based on your age, weight, and how many tablets you took.
When to stop taking Pepto-Bismol and see a doctor
Do not take Pepto-Bismol for more than two days. If your symptoms have not improved by then, or if they get worse, call your doctor. Diarrhea and stomach upset can signal infections, food poisoning, or other conditions that need different treatment.
Stop taking Pepto-Bismol when ready and seek medical attention if you notice black or tarry stools, vomit that looks like coffee grounds, severe abdominal pain, ringing in your ears, or difficulty hearing. These are signs of serious side effects.
If you are pregnant or breastfeeding, do not take Pepto-Bismol without talking to your doctor first. Bismuth subsalicylate can pass into breast milk and may affect a developing baby.
Medications and conditions that interact with Pepto-Bismol
Tell your doctor or pharmacist that you take Pepto-Bismol if you are on any of these medications: blood thinners like warfarin or apixaban, aspirin or other NSAIDs, methotrexate, or certain antibiotics called tetracyclines. Bismuth subsalicylate can reduce how well these drugs work or increase the risk of side effects.
If you have gout, kidney disease, or a bleeding disorder, talk to your doctor before taking Pepto-Bismol. Bismuth subsalicylate can trigger gout attacks and may worsen kidney function. People with bleeding disorders should avoid it because salicylates can thin the blood.
Pepto-Bismol can also interfere with certain medical tests, including tests for blood sugar and uric acid levels. If you are scheduled for lab work, tell the lab technician that you have been taking Pepto-Bismol.
What happens if you take more than the recommended dose
Taking more than 16 tablets in 24 hours raises your risk of salicylate toxicity. Early signs include ringing in the ears, dizziness, and mild confusion. As the dose gets higher, you may experience rapid or difficult breathing, severe headache, and loss of consciousness.
Bismuth can also cause a condition called encephalopathy, which affects the brain and nervous system. Symptoms include tremors, difficulty speaking, and personality changes. This is rare but serious and requires emergency medical care.
If someone has taken a very large overdose of Pepto-Bismol, call 911 or go to the emergency room. Bring the bottle with you so the medical team knows exactly what was taken and how much.
Alternatives if Pepto-Bismol is not right for you
If you cannot take Pepto-Bismol because of medications, allergies, or medical conditions, other over-the-counter options exist. Loperamide (Imodium) slows intestinal movement and reduces diarrhea, though it should not be used if you have bloody stools or high fever. Bismuth subsalicylate actually treats the infection; loperamide only treats the symptom.
Probiotics and electrolyte drinks do not stop diarrhea but help prevent dehydration, which is the real danger in stomach upset. Drinking water, broth, or oral rehydration solutions like Pedialyte is often enough while your body fights off the infection on its own.
For mild stomach upset without diarrhea, antacids like calcium carbonate (Tums) or famotidine (Pepcid) may help. These work differently than Pepto-Bismol and have their own dosing limits and interactions, so read the label or ask a pharmacist.
How to take chewable Pepto-Bismol safely
Chew the tablets thoroughly instead of swallowing them whole. Chewing helps the medication work faster and ensures it mixes with saliva, which aids absorption. Do not crush or break the tablets unless the label says you can.
Take Pepto-Bismol with food or milk if it upsets your stomach, though it works best on an empty stomach. Wait at least two hours after taking other medications before taking Pepto-Bismol, because bismuth can bind to some drugs and prevent your body from absorbing them.
Keep Pepto-Bismol at room temperature, away from heat and moisture. Do not use tablets that are discolored, cracked, or past the expiration date printed on the box. Store it out of reach of children.
Frequently Asked Questions
Can I take Pepto-Bismol every day for a long time?
No. Pepto-Bismol is meant for short-term use only, up to two days. Taking it longer than that can cause bismuth to build up in your body and damage your kidneys and nervous system. If you have chronic stomach problems, see a doctor instead of self-treating with over-the-counter medication.
What if I took 20 tablets in one day by mistake?
Call Poison Control at 1-800-222-1222. They will ask your age, weight, and how many tablets you took, then tell you whether you need medical attention. In most cases, taking a few extra tablets once will not cause serious harm, but it is worth checking with a professional.
Can I take Pepto-Bismol with ibuprofen or aspirin?
No. Both ibuprofen and aspirin are NSAIDs, and Pepto-Bismol contains a salicylate, which is related to aspirin. Taking them together increases the risk of stomach bleeding and other serious side effects. If you need pain relief, use acetaminophen (Tylenol) instead, or talk to your doctor about what is safe for you.
Why do my stools turn black after taking Pepto-Bismol?
Black stools are a normal, harmless side effect of Pepto-Bismol. Bismuth reacts with sulfur in your digestive tract and turns dark gray or black. This is not blood and does not mean anything is wrong. The color will return to normal once you stop taking the medication.
Is it safe to take Pepto-Bismol if I am on blood thinners?
No. Bismuth subsalicylate can increase the blood-thinning effect of medications like warfarin or apixaban, raising your risk of bleeding. Talk to your doctor or pharmacist about what you can safely take for stomach upset if you are on a blood thinner.