Drug interactions
Difenoxin + Melatonin
Severity: Moderate
Difenoxin and Melatonin: moderate interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Difenoxin is an opioid antidiarrheal related to diphenoxylate that can cause drowsiness, and melatonin may add to this. Impaired alertness may occur.
What this interaction means in plain words
Difenoxin and Melatonin can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Difenoxin belongs to Gastrointestinal Tract; Melatonin belongs to Gastrointestinal Tract.
Why it happens
Additive CNS depression from opioid-receptor activity and melatonin-mediated sedation.
What to do
Counsel the patient about additive drowsiness and avoid driving; reduce one agent if excessive sedation occurs.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Melatonin
- Fluvoxamine + Melatonin Major
- Alfentanil + Melatonin Moderate
- Belladonna and opium + Melatonin Moderate
- Buprenorphine buccal + Melatonin Moderate
- Butabarbital + Melatonin Moderate
- Butalbital + Melatonin Moderate
Other interactions of Difenoxin
Frequently asked questions
Can I take Difenoxin with Melatonin?
MediHelp rates the interaction as moderate. Difenoxin and Melatonin can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Difenoxin is an opioid antidiarrheal related to diphenoxylate that can cause drowsiness, and melatonin may add to this. Impaired alertness may occur.
How serious is the interaction between Difenoxin and Melatonin?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Counsel the patient about additive drowsiness and avoid driving; reduce one agent if excessive sedation occurs.
What other medicines interact with Melatonin?
MediHelp also lists interactions of Melatonin with, for example, Fluvoxamine, Alfentanil, Belladonna and opium. The full list is on the Melatonin page.
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