Standard Pepto-Bismol Tablet Dosage
The standard dose of Pepto-Bismol tablets is two tablets every 30 minutes to one hour, up to eight doses in 24 hours. Do not exceed 16 tablets in a 24-hour period. Each regular-strength tablet contains 262 mg of bismuth subsalicylate, the active ingredient that reduces stomach acid and kills some bacteria that cause diarrhea and upset stomach.
Most people take two tablets at a time, wait to see if symptoms improve, and repeat only if needed. You do not have to take the full dose if your symptoms are mild — one tablet may be enough. The tablets work best when chewed or dissolved on your tongue rather than swallowed whole, because the medication needs to coat your stomach lining.
Pepto-Bismol tablets typically begin working within 30 minutes. If your symptoms have not improved after two hours and two doses, or if they worsen, stop taking the tablets and contact a doctor or pharmacist.
Key Takeaways
- Take two Pepto-Bismol tablets every 30 minutes to one hour, with a maximum of eight doses or 16 tablets in 24 hours.
- Chew or dissolve the tablets on your tongue instead of swallowing them whole so the medication coats your stomach.
- Do not take Pepto-Bismol for more than two days without talking to a doctor, because prolonged use can cause side effects.
- Pepto-Bismol contains salicylates, so avoid it if you are allergic to aspirin or take blood thinners like warfarin.
- Stop taking the tablets and contact a doctor if symptoms worsen, you vomit blood, or you have black or tarry stools.
When to Take One Tablet Instead of Two
If you have mild stomach upset, nausea, or indigestion without diarrhea, one tablet may be sufficient. Start with one and wait 30 minutes to an hour before taking another. This approach reduces your total daily intake and is safer if you are older, weigh less than average, or have kidney or liver problems.
Children ages 12 and up can take the adult dose of two tablets. Children under 12 should not take regular Pepto-Bismol tablets without a doctor's instruction, because bismuth subsalicylate can cause serious side effects in young children. Some manufacturers make a children's liquid version with a lower concentration.
Conditions That Require a Different Dose or No Pepto-Bismol
Do not take Pepto-Bismol if you are allergic to salicylates (the compound in aspirin), have a bleeding disorder, or take blood thinners such as warfarin or clopidogrel. Bismuth subsalicylate can increase bleeding risk and interact with these medications.
If you have kidney disease, gout, or a history of ulcers, talk to a doctor or pharmacist before taking Pepto-Bismol, even at the standard dose. Bismuth can accumulate in the body and cause problems in people with reduced kidney function. Pregnant women should avoid Pepto-Bismol, especially in the third trimester, because salicylates can affect the fetus and complicate labor.
If you have a fever above 101°F (38.3°C) along with diarrhea, or if diarrhea lasts more than two days, contact a doctor instead of treating it at home. These signs may point to an infection that needs different treatment.
What Happens If You Take Too Much
Taking more than 16 tablets in 24 hours or using Pepto-Bismol for more than two days can cause side effects. The most common is a temporary darkening of the tongue and stool, which is harmless and reverses when you stop taking the medication. However, long-term overuse can lead to bismuth toxicity, which causes confusion, tremors, and kidney damage.
If you accidentally take more than the recommended dose, drink water and monitor yourself for dizziness, ringing in the ears, or severe nausea. Contact poison control (1-800-222-1222 in the United States) or go to an emergency room if you experience confusion, difficulty breathing, or loss of consciousness.
How Pepto-Bismol Tablets Compare to Liquid and Chewables
Pepto-Bismol comes in three forms: tablets, liquid, and chewable tablets. The regular tablets contain 262 mg of bismuth subsalicylate per tablet. The liquid contains 262 mg per 15 mL (about one tablespoon), so the dose is the same whether you choose tablets or liquid. Chewable tablets also contain 262 mg each and work the same way as regular tablets.
Tablets are portable and do not stain clothes the way the pink liquid can. Liquid works faster for some people because it coats the stomach when ready without needing to be chewed. Chewables taste better to some people but still require chewing to work effectively. Choose whichever form you will actually use and remember to take on schedule.
When to Stop Taking Pepto-Bismol and See a Doctor
Stop taking Pepto-Bismol and contact a doctor if you have black or tarry stools, vomit that looks like coffee grounds, severe abdominal pain, or bloody diarrhea. These signs may indicate internal bleeding or a serious infection. Also stop if you develop a rash, difficulty breathing, or swelling of the face or throat, which could signal an allergic reaction.
If diarrhea or upset stomach lasts longer than two days despite taking Pepto-Bismol at the correct dose, or if symptoms get worse after one dose, contact a doctor. Persistent symptoms may mean you need a different treatment or a medical evaluation to rule out infection or other conditions.
Frequently Asked Questions
Can I take Pepto-Bismol with food or on an empty stomach?
Pepto-Bismol works best on an empty stomach or at least one hour after eating. If you have taken food recently, wait before taking a dose. You can eat normally between doses, but avoid fatty or spicy foods while your stomach is upset, as they can trigger more symptoms.
Does Pepto-Bismol interact with other over-the-counter medicines?
Pepto-Bismol can interact with blood thinners, aspirin, and some antibiotics. If you take any regular medications, check the label or ask a pharmacist before taking Pepto-Bismol. Do not combine it with other bismuth-containing products, as this increases the risk of overdose.
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 completely normal — it reverses within a few days of stopping the medication and does not mean anything is wrong.
Is it safe to take Pepto-Bismol every day for prevention?
No. Pepto-Bismol is meant for short-term relief of acute stomach upset, not daily prevention. Taking it every day can lead to bismuth buildup and side effects. If you have chronic digestive problems, talk to a doctor about longer-term solutions.
Can I take Pepto-Bismol if I am pregnant?
Pepto-Bismol is not recommended during pregnancy, especially in the third trimester. Salicylates can cross the placenta and affect fetal development. If you have stomach upset while pregnant, contact your doctor for safer alternatives like ginger or plain antacids.