NutriStack
Alcohol and Tamsulosin, a caution.
Tamsulosin can cause orthostatic hypotension, particularly when treatment is started or restarted. Alcohol also worsens orthostatic blood pressure control and can trigger syncope. Taking them together can increase dizziness, fainting, and fall risk, especially in older adults or people already taking blood pressure medicines.
One pair, every claim cited. The two substances, the type, the mechanism, the recommendation, and the primary literature.
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From the interaction database
What the row says.
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At a glance
- Substances
- Alcohol and Tamsulosin
- Pair type
- Caution
- Evidence (highest tier)
- Moderate
- Source citations
- 2 sources
- Stack Score effect
- −5 to your Stack Score (per scored caution row).
- Scope
- Supplement × Prescription
- Last verified
- May 30, 2026
Caution · Moderate evidence
Caution
What is happening. Tamsulosin can cause orthostatic hypotension, particularly when treatment is started or restarted. Alcohol also worsens orthostatic blood pressure control and can trigger syncope. Taking them together can increase dizziness, fainting, and fall risk, especially in older adults or people already taking blood pressure medicines.
Mechanism. Tamsulosin blocks alpha1A and alpha1D adrenergic receptors in the lower urinary tract but can still reduce vascular alpha1 tone enough to cause orthostatic symptoms. Alcohol impairs vasoconstrictor compensation during standing, producing additive orthostatic hypotension.
Recommendation. Avoid or sharply limit alcohol when starting or restarting tamsulosin. If you drink, keep intake low, rise slowly from sitting or lying down, and stop the combination if you feel lightheaded or faint.
Sources (2)
- Bird ST, Delaney JA, Brophy JM, Etminan M, Skeldon SC, Hartzema AG. Tamsulosin treatment for benign prostatic hyperplasia and risk of severe hypotension in men aged 40-85 years in the United States: risk window analyses using between and within patient methodology. BMJ. 2013;347:f6320. PMID 24192967
- Narkiewicz K, Cooley RL, Somers VK. Alcohol potentiates orthostatic hypotension: implications for alcohol-related syncope. Circulation. 2000;101(4):398-402. PMID 10653831
Stack Score
How this pair moves the number.
Effect on the composite score
If both Alcohol and Tamsulosin are in the same stack, this pair applies −5 to your Stack Score (per scored caution row).
The full algorithm, the clamping rules, and four worked stacks are documented at /methodology/stack-score.
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