What Is the Best Anti-Diarrhea Medication To Feel Better Fast?

Anti-diarrheal medicines can help control certain symptoms, but the right choice depends on what is causing the diarrhea, which other symptoms are present and whether the product is safe for you. For most short-term cases, replacing lost fluids and electrolytes is the first priority. Medicine may provide temporary relief, but it does not replace hydration or treatment for an underlying infection or health condition.

Start with fluids and electrolytes

Diarrhea causes the body to lose water and electrolytes. Drink water and other clear liquids while symptoms continue. Oral rehydration solutions can be especially helpful for older adults, people with weakened immune systems and anyone experiencing significant fluid loss.

Watch for signs of dehydration, including:

• Extreme thirst or dry mouth
• Urinating less than usual or dark-colored urine
• Dizziness, light-headedness or fainting
• Unusual tiredness or weakness

How common anti-diarrheal medications compare

If your main goal is comparing products by active ingredient, format and package size, use the updated Best OTC Diarrhea Medicine guide.

Loperamide HCl

Loperamide HCl is an anti-diarrheal active ingredient. Current Drug Facts labeling for loperamide HCl 2 mg states that it controls symptoms of diarrhea, including travelers' diarrhea.

How does loperamide work?

Loperamide slows movement through the digestive tract. This gives the body more time to absorb water and can reduce the frequency of loose stools. It controls symptoms but does not treat every possible cause of diarrhea.

What is the difference between loperamide and Imodium?

Loperamide is the active ingredient. Imodium A-D is a brand-name product containing loperamide HCl. Other products may use the same active ingredient and strength while differing in inactive ingredients, format, package count, manufacturer and price.

Read the full comparison in Loperamide vs. Imodium: What's the Difference?

What if diarrhea comes with gas and bloating?

A multi-symptom formula may combine loperamide HCl 2 mg with simethicone 125 mg. Loperamide addresses diarrhea, while simethicone relieves gas-related bloating, pressure and cramps. The combination is not simply a stronger version of loperamide. It adds an ingredient for an additional symptom.

See the side-by-side guide to loperamide versus loperamide with simethicone.

Loperamide safety

Always follow the Drug Facts directions. Taking more than directed can cause serious heart problems or death. Do not use loperamide if you have bloody or black stool. Ask a doctor before use if you have fever, mucus in the stool, a history of liver disease or an abnormal heart rhythm. Ask a doctor or pharmacist before use if you take prescription medicine.

Tiredness, drowsiness or dizziness may occur. Stop use and ask a doctor if symptoms get worse, diarrhea lasts more than two days or you develop abdominal swelling or bulging.

Bismuth subsalicylate

Bismuth subsalicylate is used for diarrhea, heartburn and upset stomach in adults and children age 12 and older. It works differently from loperamide by decreasing the flow of fluids and electrolytes into the bowel and reducing inflammation.

What should shoppers know?

Bismuth subsalicylate can temporarily darken the tongue or stool. This effect is generally harmless, but black or bloody stool present before treatment requires medical advice.

Ask a doctor or pharmacist before use if you have an aspirin or salicylate allergy, take blood thinners or daily aspirin, have an ulcer or bleeding problem, have kidney disease or take medicines for diabetes, arthritis or gout. Children and teenagers who have or are recovering from flu-like symptoms or chickenpox should not use salicylate-containing products unless directed by a healthcare professional.

Stop use and contact a doctor if diarrhea gets worse or lasts longer than 48 hours.

Prescription anti-diarrheal and infection-specific treatment

Diphenoxylate with atropine

Diphenoxylate is combined with atropine in a prescription medicine that reduces bowel activity. It is used along with fluid and electrolyte replacement. Because it can cause drowsiness, dizziness and other side effects, it should be taken exactly as prescribed.

A clinician may avoid it when diarrhea is bloody or accompanied by fever, mucus, abdominal swelling or certain infections. Do not use someone else's prescription medicine.

Antibiotics and antiparasitic medicines

Diarrhea can result from viruses, bacteria, parasites, medicines, food sensitivities or chronic digestive conditions. Antibiotics only treat certain bacterial infections, and an antiparasitic medicine must match the specific parasite. Metronidazole and other prescription drugs should not be treated as general-purpose diarrhea medicines.

A healthcare professional may use your symptoms, recent travel, medication history and laboratory testing to identify the cause and choose an appropriate treatment. Do not start leftover antibiotics or take an antibiotic simply because diarrhea is present.

When should you contact a doctor?

Adults should contact a healthcare professional promptly for:

• Diarrhea lasting more than two days
• Six or more loose stools in one day
• High fever
• Frequent vomiting or an inability to keep liquids down
• Severe abdominal or rectal pain
• Black, tarry, bloody or pus-containing stool
• Signs of dehydration
• Diarrhea during or soon after antibiotic use

Older adults, pregnant people, people taking antibiotics and those with a weakened immune system or another significant health condition should contact a healthcare professional sooner.

Shop by symptom and package size

Choose the formula that matches the symptoms you want to relieve, then compare the active ingredients, format, package count, warnings and directions.

DBS LABS Diarrhea Relief

Single-ingredient loperamide HCl 2 mg

• Helps control diarrhea symptoms and reduce loose stools
• Convenient bottle packaging
• Choose a 96-count or 200-count supply

Shop 96 caplets

Prefer a larger bottle? Shop 200 caplets

IBS Labs Anti-Diarrheal + Anti-Gas

Loperamide HCl 2 mg + simethicone 125 mg

• Helps control diarrhea
• Relieves gas-related bloating, pressure and cramps
• 100-caplet value size

Shop diarrhea + gas relief

Compare all diarrhea relief Read the shopping guide

Key takeaways

• Replacing lost fluids and electrolytes is the first priority during diarrhea.
• Loperamide controls diarrhea symptoms, while loperamide with simethicone also addresses gas-related symptoms.
• Bismuth subsalicylate works differently and has salicylate-related warnings.
• Prescription anti-diarrheals, antibiotics and antiparasitic medicines require an individualized medical decision.
• Blood in the stool, high fever, severe pain, dehydration or symptoms lasting more than two days require medical advice.

Medical disclaimer: This article is for general educational purposes and is not medical advice. Always read and follow the complete Drug Facts label. Ask a doctor or pharmacist if you have questions about the cause of diarrhea, possible medicine interactions or whether a product is appropriate for you.