Bismuth Medications and Green Stool

Why Do Bismuth Medications Turn Stool Green?

Bismuth medications (like Pepto-Bismol and other bismuth subsalicylate products) can cause your stool to turn dark green or even black. This happens because:

• Bismuth reacts with sulfur in your digestive system
• This reaction forms bismuth sulfide, a dark compound
• The color can range from dark green to black depending on the amount taken
• This reaction is a normal and expected side effect

How Long Will My Stool Stay Green After Taking Bismuth?

The duration of green or darkened stool after taking bismuth medications depends on several factors:

• The dosage and duration of bismuth medication use
• Your individual digestive transit time
• Whether you're still taking the medication
• Your overall digestive health

Typically, the color change can last for several days after stopping the medication, sometimes up to a week.

Is Green Stool from Bismuth Medications Normal?

Yes, green or dark stool from bismuth medications is completely normal and expected. This color change:

• Is a harmless side effect
• Does not indicate any problems with the medication
• Shows the medication is working as intended
• Will resolve on its own after stopping the medication

What Other Effects Can Bismuth Medications Have?

Besides changing stool color, bismuth medications can have other effects:

• May temporarily darken your tongue
• Can cause constipation in some people
• Might affect the results of certain digestive tests
• Could interact with other medications

Always inform your healthcare provider about bismuth medication use, especially before any medical procedures.

When Should I Be Concerned About Green Stool with Bismuth?

While green stool from bismuth medications is normal, consult a healthcare provider if you experience:

• Severe abdominal pain or cramping
• Ringing in the ears (tinnitus)
• Persistent diarrhea despite medication
• Blood in the stool
• High fever
• Symptoms that worsen or don't improve