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 regular-strength tablet contains 262 mg of bismuth subsalicylate, the active ingredient that reduces stomach acid and kills some bacteria that cause diarrhea.
Do not chew the tablets — swallow them whole with water. If you are taking the liquid form instead, the dose is different: one tablespoon every 30 minutes to one hour, also capped at eight doses per day. Mixing tablets and liquid will cause you to exceed the safe daily limit.
Most people see improvement within a few hours. If diarrhea or indigestion lasts longer than two days, or if you have severe abdominal pain, vomiting, or bloody stools, stop taking Pepto-Bismol and contact a doctor or poison control.
Key Takeaways
- Take two tablets every 30 minutes to one hour, with a maximum of 16 tablets in 24 hours.
- Swallow tablets whole with water; do not chew them.
- Do not mix tablets and liquid form, as this will push you over the daily limit.
- Stop taking Pepto-Bismol and contact a doctor if symptoms last more than two days or worsen.
- Pepto-Bismol contains salicylate, which can interact with blood thinners and other medications.
Who Should Not Take Pepto-Bismol or Should Take Less
Certain people should avoid Pepto-Bismol entirely or use it only under a doctor's direction. Do not take it if you are allergic to salicylates or aspirin, since Pepto-Bismol contains a salicylate compound. Pregnant women, especially in the third trimester, should not use it because salicylates can affect the fetus and cause bleeding complications during delivery.
People taking blood thinners such as warfarin or clopidogrel should not use Pepto-Bismol without checking with their doctor first, because the salicylate can increase bleeding risk. The same applies if you take methotrexate for rheumatoid arthritis or cancer, or if you have gout or kidney disease. Children under 12 should use the liquid form at a lower dose, not tablets.
If you have a fever above 103°F (39.4°C), black or bloody stools, severe abdominal pain, or signs of dehydration (extreme thirst, dark urine, dizziness), do not take Pepto-Bismol — these are signs of a condition that needs medical attention.
What Happens If You Take Too Much
Taking more than 16 tablets in 24 hours or continuing the medication for more than two days at the maximum dose can cause salicylate toxicity. Early signs include ringing in the ears (tinnitus), confusion, rapid breathing, or a change in mental state. These symptoms mean you have taken too much and need to stop when ready.
Severe overdose can cause seizures, coma, or organ damage. If you or someone else has taken significantly more than the recommended dose — for example, an entire bottle at once — call poison control at 1-800-222-1222 (in the United States) or emergency services right away. Have the bottle with you so you can tell them the exact dose.
Long-term use above the recommended dose can also cause a condition called black tongue, a temporary darkening of the tongue caused by bismuth. This is harmless and goes away after you stop taking the medication, but it signals that you are taking too much.
Pepto-Bismol Tablets vs. Liquid and Chewables
Pepto-Bismol comes in three forms: swallowable tablets, liquid suspension, and chewable tablets. The dosing differs for each. Regular tablets are 262 mg per tablet and should be swallowed whole. Chewable tablets are also 262 mg but can be chewed or dissolved on the tongue. Liquid is 262 mg per tablespoon.
The maximum daily dose is the same across all forms — 1,048 mg of bismuth subsalicylate in 24 hours — but the number of doses you can take varies. With tablets or chewables, that is 16 tablets maximum. With liquid, it is eight tablespoons maximum. If you switch between forms, recalculate your dose to avoid going over the limit.
Tablets take longer to work than liquid because they must dissolve in your stomach, but they are easier to carry and do not stain teeth. Liquid works faster but tastes strong and can temporarily darken your tongue or stool. Chewables are a middle ground but cost more per dose.
How Long You Can Take Pepto-Bismol Safely
Pepto-Bismol is meant for short-term use only. Do not take it for more than two days without talking to a doctor. If diarrhea or indigestion lasts longer than 48 hours, the cause may be something that Pepto-Bismol cannot treat — such as a bacterial infection, food poisoning, or a digestive disorder — and you need medical evaluation.
Taking Pepto-Bismol every day for weeks or months, even at the standard dose, can cause bismuth to build up in your body and damage your kidneys or nervous system. This is rare but serious. If you find yourself reaching for Pepto-Bismol regularly, see a doctor instead of self-treating.
The only exception is if a doctor prescribes it for a specific condition, such as traveler's diarrhea prevention before a trip. In that case, follow the doctor's instructions exactly, which may differ from the over-the-counter label.
Interactions With Other Medications and Foods
Pepto-Bismol can interact with several common medications. If you take aspirin, ibuprofen, or naproxen for pain or fever, do not also take Pepto-Bismol, because both contain salicylates and combining them raises your risk of stomach bleeding and toxicity. Wait at least six hours between doses of these medications and Pepto-Bismol.
Blood thinners such as warfarin, apixaban, or clopidogrel can have their effects increased by Pepto-Bismol, raising bleeding risk. Methotrexate, used for rheumatoid arthritis and some cancers, can accumulate to toxic levels if combined with Pepto-Bismol. Diabetes medications may also be affected. Always tell your doctor or pharmacist that you are taking Pepto-Bismol before starting any new medication.
Alcohol does not directly interact with Pepto-Bismol, but drinking alcohol while you have diarrhea or indigestion will make dehydration worse and slow your recovery. Avoid alcohol until your symptoms clear.
When to See a Doctor Instead of Using Pepto-Bismol
Some symptoms look like straightforward indigestion or diarrhea but actually need medical care. If you have severe abdominal pain that does not ease within an hour, bloody or black stools, vomiting that lasts more than a few hours, signs of dehydration (extreme thirst, no urination for eight hours, severe dizziness), or a fever above 102°F (38.9°C), do not take Pepto-Bismol — go to urgent care or an emergency room.
If you have recently taken antibiotics and now have severe diarrhea with cramping, you may have Clostridioides difficile infection, which Pepto-Bismol can make worse. See a doctor before taking any over-the-counter remedy. The same applies if you have inflammatory bowel disease such as Crohn's disease or ulcerative colitis — Pepto-Bismol can trigger a flare.
Older adults, people with kidney or liver disease, and anyone taking multiple medications should check with a pharmacist or doctor before using Pepto-Bismol, even at the standard dose.
Frequently Asked Questions
Can I take Pepto-Bismol on an empty stomach?
Yes, you can take Pepto-Bismol on an empty stomach. It works by reducing stomach acid and killing bacteria, so food is not required. However, if you have a sensitive stomach, taking it with a light snack may reduce nausea. Do not take it with milk or antacids, as these can reduce how well it works.
Will Pepto-Bismol turn my stool black?
Yes. Bismuth in Pepto-Bismol reacts with sulfur in your digestive tract and turns your stool dark gray or black. This is harmless and temporary — your stool will return to normal within a few days of stopping the medication. Do not confuse this with blood in the stool, which is a medical emergency.
Can I take Pepto-Bismol with other antacids?
Do not take Pepto-Bismol at the same time as antacids containing aluminum, magnesium, or calcium, because they reduce how well Pepto-Bismol works. If you need both, take them at least two hours apart. Talk to a pharmacist about which one to take first.
Is Pepto-Bismol safe for children?
Pepto-Bismol tablets are not recommended for children under 12. Children 12 and older can take the adult dose. For younger children, use the liquid form at the dose printed on the label, or ask a pediatrician. Never give Pepto-Bismol to a child with chickenpox or flu symptoms, as salicylates can increase the risk of Reye syndrome.
What should I do if I miss a dose?
Pepto-Bismol is taken as needed, not on a schedule, so there is no "missed dose." Take it only when you have symptoms of indigestion or diarrhea, following the dosing instructions on the label. Do not take a double dose to make up for a missed one.