Drug interactions
Diphenoxylate + Melatonin
Severity: Moderate
Diphenoxylate 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
Diphenoxylate can cause drowsiness at higher doses, and melatonin may add sedation. Risk is greater in children and with overdose.
What this interaction means in plain words
Diphenoxylate 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.
Diphenoxylate 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
Use recommended doses only and counsel about drowsiness; avoid driving until the response is known.
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 Diphenoxylate
Frequently asked questions
Can I take Diphenoxylate with Melatonin?
MediHelp rates the interaction as moderate. Diphenoxylate 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. Diphenoxylate can cause drowsiness at higher doses, and melatonin may add sedation. Risk is greater in children and with overdose.
How serious is the interaction between Diphenoxylate 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: Use recommended doses only and counsel about drowsiness; avoid driving until the response is known.
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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