Imocur (Loperamide Hydrochloride)

Loperamide Hydrochloride is used to manage diarrheal disorders that involve increased intestinal motility.

• Acute nonspecific diarrhea: reduces stool frequency and improves consistency.
• Chronic diarrhea: provides symptomatic control while underlying cause is addressed.
• Irritable bowel syndrome with diarrhea: alleviates loose stools and urgency.

• Loperamide Hydrochloride acts peripherally on μ‑opioid receptors in the myenteric plexus of the gastrointestinal tract. Activation of these receptors inhibits acetylcholine release, decreases smooth‑muscle contractions, and slows intestinal transit, allowing greater absorption of water and electrolytes from the lumen, thereby reducing stool output.

Loperamide Hydrochloride may cause a range of adverse reactions, most of which are mild and transient.

Common Side Effects

• Abdominal cramps: mild discomfort in the abdomen.
• Constipation: reduced bowel movements.
• Nausea: feeling of queasiness.
• Dry mouth: reduced salivation.
• Dizziness: light‑headed sensation.
• Drowsiness: mild sedation.

Serious or Rare Side Effects

• Severe constipation or paralytic ileus: risk of bowel obstruction.
• Toxic megacolon: rare but life‑threatening colonic dilation.
• Allergic reactions: rash, itching, swelling, or anaphylaxis.
• Cardiac arrhythmias: QT prolongation with high doses or drug interactions.

When considering Loperamide Hydrochloride, several safety measures should be observed.

• Assess dehydration: ensure adequate fluid and electrolyte replacement before use.
• Limit duration: do not exceed 48 hours without medical review.
• Avoid in infectious diarrhea: contraindicated when diarrhea is caused by bacterial or parasitic infection.
• Use caution in hepatic impairment: dose may need adjustment due to reduced metabolism.
• Pediatric use: not recommended for children under 2 years without physician guidance.
• Store at ambient temperature: keep in original packaging, protect from moisture and direct sunlight.

Loperamide Hydrochloride can interact with other medicines, altering its efficacy or safety profile.

Major Interactions (Avoid)

• Strong CYP3A4 inhibitors (e.g., ketoconazole, erythromycin): increase systemic exposure.
• P‑glycoprotein inhibitors (e.g., quinidine, ritonavir): raise plasma levels and risk of cardiac toxicity.
• Other antidiarrheal agents (e.g., diphenoxylate): additive effect leading to severe constipation.
• Opioid analgesics: may enhance central opioid effects if blood‑brain barrier is crossed.

Moderate Interactions (Monitor Closely)

• Anticholinergic drugs: may exacerbate constipation.
• Sedatives or CNS depressants: can increase drowsiness.
• Antifungal azoles (e.g., fluconazole): modest increase in loperamide levels.
• Antidepressants affecting QT interval (e.g., citalopram): monitor cardiac rhythm.