Is it safe to take melatonin with terazosin?
No known interactions exist between melatonin and terazosin. Melatonin, a hormone supplement for sleep, and terazosin, an alpha-blocker for high blood pressure or BPH, do not directly interfere in standard drug interaction databases.[1][2] You can generally take them together without issue.
What do interaction checkers say?
Tools like Drugs.com, WebMD, and Drugs Interaction Checker report no interactions. Terazosin lowers blood pressure by relaxing blood vessels; melatonin mildly affects blood pressure but shows no conflicting effects here.[1][3][4]
Could there be blood pressure effects?
Terazosin can cause dizziness or low blood pressure, especially at night. Melatonin promotes sleep and has minimal blood pressure impact, but starting either may amplify drowsiness. Monitor for lightheadedness when standing, particularly if new to terazosin.[2][5]
What do doctors recommend?
Consult your doctor or pharmacist before combining, as individual factors like dosage, other meds (e.g., blood pressure drugs), or conditions (e.g., hypotension) matter. They can check your full profile.[1][6]
Melatonin dosing tips with blood pressure meds
Standard melatonin dose is 0.5-5 mg before bed. Take it 30-60 minutes prior; avoid high doses (>10 mg) that might unpredictably affect blood pressure.[4][7]
Alternatives if concerned
If worried about drowsiness, try non-drug sleep aids like CBT-I or discuss with your doctor switching to doxazosin (similar to terazosin, no melatonin issues).[2][5]
[1]: Drugs.com - Melatonin and Terazosin Interaction
[2]: WebMD - Terazosin Details
[3]: Drugs.com Interaction Checker
[4]: WebMD - Melatonin Details
[5]: Mayo Clinic - Terazosin
[6]: Cleveland Clinic - Drug Interactions
[7]: Sleep Foundation - Melatonin Dosage