Standard Dosing for Pepto-Bismol Tablets
The standard dose of Pepto-Bismol tablets is two tablets every 30 minutes to one hour, up to a maximum of eight doses in 24 hours. That means you should not take more than 16 tablets in a single day. Each tablet contains 262 mg of bismuth subsalicylate, the active ingredient that reduces stomach acid and kills some bacteria that cause diarrhea and upset stomach.
Do not chew the tablets — swallow them whole with water. If you are treating diarrhea, you can continue taking the tablets for up to two days. If symptoms persist beyond two days, or if you have bloody stools, severe abdominal pain, or a high fever, stop taking Pepto-Bismol and contact a doctor or pharmacist.
Children ages 12 and older can follow the adult dosing schedule. Children under 12 should not take Pepto-Bismol tablets without talking to a doctor first, because bismuth subsalicylate carries different safety considerations for younger children.
Key Takeaways
- The maximum daily dose is 16 tablets (eight doses of two tablets each) spread across 24 hours.
- Space doses at least 30 minutes apart, and do not exceed eight doses in one day.
- Stop taking Pepto-Bismol after two days of use; if symptoms continue, see a doctor.
- Do not give Pepto-Bismol tablets to children under 12 without medical guidance.
- Bismuth subsalicylate can interact with blood thinners, aspirin, and certain antibiotics — tell your doctor or pharmacist what you are taking.
Who Should Not Take Pepto-Bismol Tablets
Do not take Pepto-Bismol if you are allergic to salicylates (the compound related to aspirin) or any ingredient in the tablet. People who take blood thinners like warfarin or clopidogrel should avoid Pepto-Bismol, because bismuth subsalicylate can increase bleeding risk. If you take aspirin regularly for heart health or pain relief, check with your pharmacist before adding Pepto-Bismol — taking both together raises the risk of side effects.
Pepto-Bismol is not safe during pregnancy, especially in the third trimester, because bismuth subsalicylate can cross the placenta and affect the fetus. If you are pregnant or breastfeeding, talk to your doctor about safer options for stomach upset or diarrhea. People with kidney disease or gout should also check with a doctor first, because bismuth can accumulate in the body and trigger flare-ups.
Common Side Effects and When to Stop
Most people tolerate Pepto-Bismol well, but some experience a darkening of the tongue or stool — this is harmless and temporary. Constipation, nausea, and mild headache can occur. These side effects usually fade once you stop taking the tablets.
Stop taking Pepto-Bismol when ready and contact a doctor if you experience ringing in the ears, severe dizziness, confusion, rapid heartbeat, or signs of an allergic reaction (rash, swelling of the face or throat, difficulty breathing). Bismuth toxicity is rare at standard doses but can happen if you take far more than recommended or use the tablets for weeks without stopping.
Pepto-Bismol Tablets vs. Liquid and Chewables
Pepto-Bismol comes in three forms: tablets, liquid, and chewable tablets. The standard tablets contain 262 mg of bismuth subsalicylate per tablet. The liquid form contains 262 mg per 15 mL (one tablespoon), so the dosing is similar — you measure out the liquid instead of counting tablets. Chewable tablets also contain 262 mg each and follow the same dosing schedule as swallowed tablets.
Tablets are portable and do not stain clothes the way the pink liquid can. Chewables work faster because they dissolve in your mouth, but some people find the taste unpleasant. Liquid is easier for people who have trouble swallowing pills. All three forms work the same way and carry the same safety limits — do not exceed 16 tablets' worth of active ingredient in 24 hours, regardless of which form you choose.
What to Do If You Take Too Much
If you accidentally take more than eight doses (16 tablets) in 24 hours, do not panic — a single overdose is unlikely to cause serious harm. Watch for signs of bismuth toxicity: confusion, ringing in the ears, severe dizziness, rapid heartbeat, or difficulty breathing. If any of these appear, contact Poison Control at 1-800-222-1222 (available 24/7 in the United States) or go to an emergency room.
If you have taken Pepto-Bismol regularly for more than two weeks at doses above the recommended amount, tell your doctor. Bismuth can build up in your body over time and cause neurological symptoms. Your doctor may order blood tests to check your kidney function and bismuth levels.
Interactions with Other Medications
Bismuth subsalicylate can interact with several common medications. If you take blood thinners (warfarin, apixaban, dabigatran), do not use Pepto-Bismol without checking with your pharmacist first — it may increase your bleeding risk. Aspirin and other nonsteroidal anti-inflammatory drugs (NSAIDs) like ibuprofen or naproxen should not be combined with Pepto-Bismol, because the combination raises your risk of stomach ulcers and bleeding.
Certain antibiotics, especially tetracyclines and quinolones, can be less effective if you take them with Pepto-Bismol at the same time. If you are on an antibiotic, take it at least two hours before or after your Pepto-Bismol dose. Methotrexate (used for rheumatoid arthritis and some cancers) can accumulate to toxic levels if combined with bismuth subsalicylate. Always tell your pharmacist or doctor what you are taking before using Pepto-Bismol.
When to See a Doctor Instead of Using Pepto-Bismol
Pepto-Bismol works well for mild stomach upset and diarrhea caused by food or minor stomach bugs. However, some conditions need medical attention instead. If you have bloody stools, severe abdominal pain, a fever above 102°F, signs of dehydration (extreme thirst, dark urine, dizziness), or diarrhea lasting more than two days, see a doctor. These can signal food poisoning, a bacterial infection, inflammatory bowel disease, or other conditions that Pepto-Bismol cannot treat.
If you have recently taken antibiotics and develop diarrhea, contact your doctor — this may be a sign of Clostridioides difficile infection, which requires prescription treatment, not over-the-counter bismuth. Older adults and people with weakened immune systems should be especially cautious and contact a doctor sooner rather than later.
Frequently Asked Questions
Can I take Pepto-Bismol tablets every day for stomach problems?
No. Pepto-Bismol is meant for short-term use only — up to two days for diarrhea or upset stomach. If you need it more often, you likely have an underlying condition that needs diagnosis. Talk to your doctor about chronic stomach issues instead of relying on over-the-counter tablets.
What happens if I take Pepto-Bismol with alcohol?
Alcohol can irritate your stomach further and may increase your risk of stomach ulcers when combined with bismuth subsalicylate. It is best to avoid alcohol while taking Pepto-Bismol and for at least 24 hours after your last dose.
Does Pepto-Bismol work for nausea and vomiting?
Pepto-Bismol can help mild nausea related to indigestion or upset stomach, but it is not designed to treat vomiting. If you are vomiting, you may not be able to keep the tablets down, and you risk dehydration. See a doctor if vomiting lasts more than a few hours.
Can I take Pepto-Bismol with food?
Yes, you can take Pepto-Bismol tablets with or without food. Taking it with a light meal may reduce stomach irritation if the tablets cause mild discomfort on an empty stomach.
Why does Pepto-Bismol turn my tongue and stool black?
Bismuth subsalicylate reacts with sulfur in your mouth and digestive tract, creating a harmless black compound. This darkening is temporary and goes away once you stop taking the tablets. It is not a sign of bleeding or a serious problem.