Approved indications. Diphenoxylate hydrochloride with atropine sulfate is approved in the United States as adjunctive therapy for the management of diarrhea in patients 13 years of age and older; it is not intended for use in diarrhea caused by certain serious infections such as Clostridioides difficile or invasive bacteria.

Off‑label uses (evidence limited).

• Sometimes used for symptomatic control of chronic noninfectious diarrhea (for example, in irritable bowel syndrome with diarrhea or short‑bowel–related diarrhea) when first‑line measures and loperamide are inadequate.
• Occasionally used under specialist supervision for diarrhea related to some medications (such as certain chemotherapies or antiretrovirals) when other options are unsuitable.
• Evidence for these uses is mostly from clinical experience and small studies rather than large, high‑quality trials, so therapy is individualized.

Efficacy expectations.

• In acute diarrhea, improvement in stool frequency and consistency is often seen within 24–48 hours of starting the usual dose; lack of benefit after about 48 hours generally prompts reevaluation.
• In chronic diarrhea, if symptoms are not adequately improved after up to 10 days at the maximum recommended dose, continued use is unlikely to help and other diagnoses or treatments are considered.
• When effective, it reduces stool number, urgency, and incontinence similarly to other opioid‑like antidiarrheals, but loperamide is usually tried first because it has less potential for central nervous system effects and abuse.

Typical dosing (oral tablets, patients ≥13 years).

• Initial dose: 2 tablets (each 2.5 mg diphenoxylate hydrochloride/0.025 mg atropine sulfate) by mouth four times daily, for a maximum of 8 tablets (20 mg diphenoxylate) per day.
• Once diarrhea is controlled, the dose is reduced to the lowest amount that maintains control; many patients can decrease to 2 tablets per day or similar.
• If chronic diarrhea does not improve after up to 10 days on the maximum recommended dose, treatment is usually stopped and other causes or therapies are evaluated.
• Not recommended for patients under 13 years of age and contraindicated in children under 6 years.

How to take.

• Swallow tablets whole with a full glass of water; they can be taken with or without food.
• Maintain adequate fluid and electrolyte intake (for example, oral rehydration solutions or clear liquids) to prevent or correct dehydration from diarrhea.
• Do not exceed the prescribed dose or frequency, and do not use longer than directed by your clinician.

Special instructions.

• Avoid alcohol and other medicines that cause drowsiness unless specifically approved, as combined effects can be dangerous.
• Use caution when driving or operating machinery until you know how the medicine affects your alertness.
• Stop the drug and seek medical advice if diarrhea worsens, is accompanied by high fever or blood in the stool, or is not improved within about 48 hours for acute diarrhea.

Missed dose.

• If you take the medicine on a regular schedule and miss a dose, take it as soon as you remember unless it is almost time for the next dose.
• If it is close to the time of the next dose, skip the missed dose and resume your regular schedule; do not double doses.

Overdose.

• Overdose can cause delayed but potentially life‑threatening opioid and anticholinergic toxicity, including extreme drowsiness, confusion, very slow or difficult breathing, very dry and hot skin, fast heart rate, fever, muscle stiffness, or abnormal pupil size.
• This is a medical emergency; call 911 (or your local emergency number) and contact Poison Control at 1‑800‑222‑1222 immediately.

Common side effects.

• Drowsiness, dizziness, headache, or restlessness, usually mild and more noticeable when first starting the medicine or at higher doses.
• Dry mouth, blurred vision, constipation, nausea, loss of appetite, or mild abdominal discomfort due to its opioid and anticholinergic effects.
• Flushing, faster heart rate, and difficulty urinating, especially in older adults or people taking other drugs with anticholinergic properties.

Serious or rare adverse effects (seek immediate medical attention).

• Severe drowsiness, confusion, unusual behavior, seizures, or very slow or difficult breathing, which can signal opioid and/or anticholinergic toxicity or overdose.
• Severe abdominal pain, bloating, vomiting, inability to pass gas or stool, or a very swollen abdomen, which may indicate paralytic ileus or toxic megacolon.
• Fever, worsening diarrhea, or diarrhea with blood or mucus, especially after recent antibiotic use, which can indicate infectious or inflammatory causes where this drug should not be used.
• Signs of a serious allergic reaction such as rash, hives, itching, swelling of the face, lips, tongue, or throat, or trouble breathing.

Warnings and precautions.

• Contraindicated in children under 6 years of age because of the risk of severe respiratory and central nervous system depression; safety and effectiveness are not established in patients under 13 years.
• Use cautiously in older adults; in people with liver disease, obstructive jaundice, glaucoma, urinary retention, enlarged prostate, Down syndrome, or severe dehydration; and in those with a history of substance use disorder.
• Do not use to treat diarrhea caused by C. difficile or other enterotoxin‑producing bacteria, or during acute severe ulcerative colitis flares, because slowing the gut can increase the risk of serious complications such as toxic megacolon.
• Pregnancy: use only if the potential benefit justifies possible risks to the fetus, particularly avoiding use near delivery because opioid effects can depress the newborn’s breathing.
• Breastfeeding: both diphenoxylate’s active metabolite and atropine may enter breast milk; other antidiarrheals are often preferred, and infants should be monitored for poor feeding, constipation, or unusual sleepiness if exposure occurs.

Relative safety compared with other antidiarrheals. Compared with loperamide and some non‑opioid antidiarrheals, diphenoxylate‑atropine carries higher risks of drowsiness, anticholinergic effects, and abuse or dependence, so it is generally reserved for cases not adequately controlled by safer first‑line options.

Reporting side effects and safety updates. Side effects should be reported to a healthcare professional and can also be reported directly to the FDA through the MedWatch program (online or by phone at 1‑800‑FDA‑1088); current safety communications and labeling updates are available from the FDA and the manufacturer.

Major drug and substance interactions.

• Other central nervous system depressants (such as opioids, benzodiazepines, sleep medicines, some antidepressants, antipsychotics, muscle relaxants, antihistamines, and alcohol) can add to drowsiness, slow breathing, and increase the risk of falls and accidents.
• Other anticholinergic drugs (for example, certain antidepressants, antipsychotics, bladder spasm medicines, anti‑nausea drugs, and some allergy or cold preparations) can intensify dry mouth, blurred vision, constipation, confusion, and trouble urinating.
• Medicines that markedly slow gut movement (such as other opioids, loperamide, and some antispasmodics) taken together can increase the risk of severe constipation, paralytic ileus, or toxic megacolon.
• Because diphenoxylate is structurally related to meperidine, use with monoamine oxidase inhibitors (MAOIs) is generally avoided due to a theoretical risk of serious nervous system or blood pressure reactions.

Food, alcohol, and over‑the‑counter products.

• No specific food interactions are known, but bland foods and sufficient fluids are usually recommended while recovering from diarrhea.
• Avoid alcohol and recreational sedatives, which can greatly increase central nervous system depression and impair judgment and coordination.
• Check labels on over‑the‑counter cold, allergy, or sleep medicines, which often contain sedating antihistamines or anticholinergics that can add to side effects; ask a pharmacist or clinician if unsure.

Conditions requiring extra caution or avoidance.

• Do not use in diarrhea caused by C. difficile or other enterotoxin‑producing bacteria, or in patients with obstructive jaundice or known hypersensitivity to diphenoxylate or atropine.
• Use with great caution in people with liver impairment or a history of hepatic encephalopathy, as opioid effects on the brain may be more pronounced.
• Use cautiously in patients with glaucoma, urinary retention, enlarged prostate, cardiovascular disease, or thyroid disease, because anticholinergic effects can worsen these conditions.
• Avoid use or monitor closely in older adults, frail patients, pregnant or breastfeeding individuals, and those with a history of substance use disorder.

Monitoring needs.

• For most otherwise healthy patients using the drug briefly, routine laboratory monitoring is not required, but clinical monitoring of hydration status, stool pattern, and overall improvement is important.
• Patients with severe or prolonged diarrhea, significant comorbidities, or concurrent use of multiple sedating or anticholinergic medicines may require monitoring of electrolytes, kidney function, and more frequent clinical follow‑up.

Q: What is diphenoxylate hydrochloride and atropine sulfate used for?
A: It is an oral prescription medicine used as adjunctive therapy to reduce diarrhea in patients 13 years and older, helping slow stool frequency and improve stool consistency while other treatments address the underlying cause.

Q: How quickly will my diarrhea improve after I start taking it?
A: Many people notice fewer and more formed stools within 24–48 hours at the usual starting dose; if your symptoms are not improving by about 48 hours or are worsening, you should contact your healthcare provider.

Q: How long can I safely take this medication?
A: It is typically used for short periods until the diarrhea is controlled, and if maximum doses are needed for more than about 10 days or symptoms persist, your clinician will usually stop it and look for other causes or treatments.

Q: Can I drink alcohol or take sleeping pills with this medicine?
A: Alcohol, sleeping pills, and other sedating drugs can significantly increase drowsiness, slow breathing, and impair coordination when combined with this medicine, so they should generally be avoided unless your prescriber specifically approves.

Q: Is this medicine safe during pregnancy or while breastfeeding?
A: It is used in pregnancy only when the potential benefit clearly outweighs the risks, and because both components may pass into breast milk, other antidiarrheals are often preferred during breastfeeding; decisions should be made with your obstetric or pediatric provider.

Q: How is this different from loperamide (Imodium)?
A: Both slow intestinal movement to relieve diarrhea, but diphenoxylate‑atropine is a prescription opioid‑containing medicine with more potential for drowsiness, anticholinergic side effects, and abuse, so loperamide is usually tried first and this drug is reserved for cases that do not respond adequately.

Storage:

• Store at room temperature (about 68–77°F / 20–25°C) in a tightly closed, child‑resistant container, away from excess heat, moisture, and direct light.
• Keep out of the reach of children and pets; even a few tablets can be dangerous for young children.
• Do not store tablets in pill organizers that children can open or in places like bathrooms where humidity is high.

Disposal:

• Use a drug take‑back program if available at your pharmacy, clinic, or community collection site, as this is the preferred way to dispose of unused tablets.
• If no take‑back option is available, mix tablets (do not crush) with an undesirable substance (such as used coffee grounds or cat litter), seal in a plastic bag or container, and place in the household trash.
• Remove or scratch out personal information on empty prescription bottles before discarding; do not share this medication with anyone else.