Can You Take Melatonin with Dorzolamide?
No known interactions exist between melatonin and dorzolamide. Melatonin, a hormone supplement for sleep, and dorzolamide, a topical carbonic anhydrase inhibitor eye drop for glaucoma, do not share metabolic pathways that would cause issues like CYP enzyme competition or additive effects on intraocular pressure.[1][2]
Dorzolamide works locally in the eye with minimal systemic absorption, while melatonin is metabolized mainly by the liver. Standard drug interaction checkers, including Drugs.com and WebMD, list no warnings or precautions for this combination.[1][3]
What Happens If You Take Them Together?
Patients report no adverse effects from combining them. Melatonin's mild side effects (drowsiness, headache) and dorzolamide's (eye stinging, blurred vision) stay isolated. No clinical studies show amplified risks, but monitor for unexpected symptoms like unusual fatigue or eye irritation.[1][2]
Does Timing Matter?
Take melatonin at bedtime as usual. Apply dorzolamide eye drops earlier in the day or as prescribed—its effects last 8-12 hours without overlapping sleep induction from melatonin.[2]
Alternatives If Concerned
If worried, space doses by 2-4 hours or consult a pharmacist. For sleep with glaucoma, non-drug options like CBT-I or prescription alternatives (e.g., ramelteon) avoid supplements entirely.[3]
When to Talk to a Doctor
Always check with your eye doctor or pharmacist before starting melatonin, especially with glaucoma meds. Individual factors like other drugs or conditions could change this.[1]
Sources
[1]: Drugs.com - Melatonin and Dorzolamide Interaction Checker
[2]: RxList - Dorzolamide Prescribing Information
[3]: WebMD - Melatonin Interactions