Standard Pepto-Bismol tablet dosage for adults
The standard dose of Pepto-Bismol tablets for adults is two tablets every 30 minutes to one hour, up to a maximum of eight doses (16 tablets) in 24 hours. Do not take more than the maximum daily amount, and do not use the product for more than two days unless directed by a doctor.
Each regular-strength Pepto-Bismol tablet contains 262 mg of bismuth subsalicylate. The tablets are meant to be chewed or dissolved in your mouth rather than swallowed whole, though swallowing them whole is also acceptable. Chewing them allows the medication to work faster on stomach upset and heartburn.
If you are taking the maximum dose, space the tablets out across your day rather than taking them all at once. For example, take two tablets at 8 a.m., two at 9 a.m., two at 10 a.m., and so on, rather than trying to take eight tablets in one sitting.
Key Takeaways
- Adults take two Pepto-Bismol tablets every 30 minutes to one hour, with a maximum of 16 tablets in 24 hours.
- Do not use Pepto-Bismol for more than two days without talking to a doctor, as longer use can cause side effects.
- Chewing the tablets works faster than swallowing them whole, though both methods are acceptable.
- Children under 12 should not take Pepto-Bismol tablets without a doctor's direction, as the dosage is different and depends on age and weight.
- Stop taking Pepto-Bismol and contact a doctor if you have severe abdominal pain, bloody stools, or signs of an allergic reaction.
Dosage for children and when to call a doctor
Pepto-Bismol tablets are not recommended for children under 12 years old without a doctor's direction. If your child needs stomach relief, ask your doctor or pharmacist about the correct dose based on their age and weight, or consider other options like children's formulations of antacids.
For teenagers 12 and older, the adult dosage applies. However, if a young person has taken Pepto-Bismol and shows signs of an allergic reaction—such as rash, swelling of the lips or tongue, or difficulty breathing—call 911 or poison control when ready.
Contact a doctor or pharmacist before taking Pepto-Bismol if you are pregnant, breastfeeding, or have a history of bleeding disorders, kidney disease, or salicylate sensitivity. Bismuth subsalicylate can pass into breast milk and may affect a nursing infant.
What happens if you take too much
Taking more than the recommended dose of Pepto-Bismol tablets can cause side effects including ringing in the ears (tinnitus), confusion, severe nausea, or vomiting. In rare cases, overdose can lead to salicylate toxicity, which requires medical attention.
If you or someone else has taken more than 16 tablets in 24 hours and is experiencing symptoms, contact poison control at 1-800-222-1222 (available 24/7 in the United States) or go to an emergency room. Have the bottle with you so you can tell them the exact product and amount taken.
Pepto-Bismol tablets versus liquid suspension
Pepto-Bismol comes in both tablet and liquid form. The tablet form is convenient for travel and does not stain as easily as the liquid, which can leave pink marks on clothing and teeth. However, some people find the liquid works faster because it coats the stomach when ready.
The dosage differs between forms. Liquid Pepto-Bismol is typically dosed at 30 mL (two tablespoons) per dose, while tablets are two tablets per dose. If you switch between forms, check the label to make sure you are taking the correct amount for that product.
When Pepto-Bismol is not the right choice
Pepto-Bismol is meant for short-term relief of heartburn, indigestion, upset stomach, and diarrhea. It is not a treatment for the underlying cause of these symptoms. If your stomach problems last longer than two days, return repeatedly, or are accompanied by fever, severe pain, or bloody stools, see a doctor instead of continuing to take Pepto-Bismol.
Do not take Pepto-Bismol if you are allergic to salicylates (the active ingredient is a salicylate compound), if you have gout, or if you are taking blood thinners like warfarin or aspirin regularly. The product can interact with these medications and worsen certain conditions.
If you have a stomach ulcer, inflammatory bowel disease, or are recovering from chickenpox or flu, ask a doctor before taking Pepto-Bismol. Bismuth subsalicylate can complicate these conditions or increase the risk of Reye's syndrome in children with viral infections.
Side effects and what to watch for
Common side effects of Pepto-Bismol tablets include darkening of the tongue or stool (this is harmless and temporary), constipation, and mild nausea. These effects usually go away once you stop taking the product.
Less common but more serious side effects include severe allergic reactions, ringing in the ears, confusion, or signs of salicylate toxicity such as rapid breathing or unusual tiredness. If you experience any of these, stop taking the tablets and contact a doctor or poison control.
Bismuth subsalicylate can also cause a temporary darkening or blackening of the tongue and teeth. This is cosmetic only and will fade within a few days of stopping the medication. Brushing your teeth gently can help remove some of the discoloration.
Interactions with other medications
Pepto-Bismol tablets can interact with several common medications. If you take blood thinners (such as warfarin), aspirin, or nonsteroidal anti-inflammatory drugs (NSAIDs) like ibuprofen or naproxen, tell your doctor before taking Pepto-Bismol, as it may increase bleeding risk.
The product can also reduce the effectiveness of certain antibiotics, particularly tetracyclines. If you are taking an antibiotic, ask your pharmacist whether it is safe to use Pepto-Bismol at the same time, or whether you should wait a few hours between doses.
If you take diabetes medications, methotrexate, or probenecid, check with a pharmacist before using Pepto-Bismol. Bismuth subsalicylate may affect how these drugs work in your body.
Frequently Asked Questions
Can I take Pepto-Bismol tablets with food?
Yes, you can take Pepto-Bismol with or without food. Taking it with food may slow how quickly it works, but it will not reduce its effectiveness. If your stomach is very upset, taking it on an empty stomach may provide faster relief.
How long does it take for Pepto-Bismol tablets to work?
Pepto-Bismol tablets typically begin to work within 15 to 30 minutes if you chew them, or within 30 to 60 minutes if you swallow them whole. The liquid form usually works faster because it coats the stomach when ready.
Will Pepto-Bismol tablets turn my stool black?
Yes, Pepto-Bismol commonly causes temporary darkening or blackening of the stool and tongue. This is harmless and caused by the bismuth in the medication. The discoloration will fade within a few days of stopping the product.
Can I take Pepto-Bismol every day?
No, Pepto-Bismol is not meant for daily long-term use. Do not take it for more than two days without a doctor's direction. If you have ongoing stomach problems, see a doctor to find out what is causing them rather than treating symptoms with over-the-counter medication.
Is Pepto-Bismol safe if I am taking aspirin?
No, you should not take Pepto-Bismol if you are taking aspirin regularly, as both contain salicylates and can increase bleeding risk. Talk to your doctor about other options for stomach relief if you are on aspirin therapy.