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Probe · tadalafil · 3 min read

Can Cialis 10 mg start next to an alpha-blocker?

Yes, for ED, if the alpha-blocker is already stable and Cialis starts at the lowest recommended dose. Both drug classes are vasodilators. Together they can drop blood pressure. For BPH, Cialis plus an alpha-blocker is not recommended. This vault's 10 mg as-needed line is an ED start, not a BPH stack. Volume depletion and other antihypertensives add to the same floor.

Medically reviewed by Dr. Mateo Ruiz, MD - Clinical pharmacology, Barcelona

Last reviewed

Updated

01Does BPH change that advice?

Forest-green still life: two bottles in a stable pair, one already open

Combination use for prostate symptoms is not recommended. BPH on this label is 5 mg daily monotherapy. See BPH 5 mg.

Tadalafil alone for BPH stays approved. The problem is two urinary vasodilators, not tadalafil as the only BPH drug.

02What pressure change did the interaction work show?

Clinical pharmacology studies coadministered tadalafil with doxazosin, tamsulosin, or alfuzosin. Additive blood-pressure-lowering is the expected class effect. This page does not retell each mm Hg walk.

Symptomatic hypotension, including fainting, is the labelled risk when the two vasodilators share a chart.

03What else lowers the floor next to an alpha-blocker?

Intravascular volume depletion and other antihypertensive drugs can affect the safety of the combination. A dry, over-diuresed chart is a poor night to debut tadalafil.

Substantial alcohol is another vasodilator. Five units sit on their own warning. See five glasses.

04What is the lowest Cialis start next to an alpha-blocker?

In those patients who are stable on alpha-blocker therapy, Cialis should be initiated at the lowest recommended dose. For as-needed ED that lowest labelled tablet is 5 mg, not this vault's usual 10 mg debut.

If an optimized Cialis dose is already in place, a new alpha-blocker starts at its lowest dose. Stepwise increases can drop pressure further.

05Can a second PDE5 cover a weak night on the alpha-blocker?

A second PDE5 the same night is never the workaround. Usual as-needed frequency is one tadalafil tablet a day. The alpha-blocker row does not create an exception.

Nitrates stay forbidden on top of this pair. See nitrates and 48 hours.

06What does stable on the alpha-blocker mean?

Patients should be stable on alpha-blocker therapy prior to initiating a PDE5 inhibitor. Men who are already dizzy or hypotensive on the alpha-blocker alone are at higher risk when tadalafil is added.

If the alpha-blocker is new this week, wait for that dose to settle before anyone writes 10 mg as needed.

Sources

  1. DailyMed CIALIS (tadalafil) Dosage and Administration 2.7 and Warnings 5.6: alpha-blockers

Checked against the current label and reviewed by Dr. Mateo Ruiz. See Probe, Assay, Glow-check, Seal.

Vault consult

Answers follow the U.S. Cialis label.

Joan M. I have been on tamsulosin for months. Can 10 mg start Friday?

Vault reply

Stability is the first ask. The labelled Cialis start next to an alpha-blocker is the lowest recommended dose. For as-needed ED that is 5 mg, not an automatic 10 mg debut.

Freya O. I take 5 mg Cialis daily for BPH and my GP added doxazosin.

Vault reply

That BPH stack is not recommended. Bring both drugs back to the writer.

Tariq E. If I feel fine on both, can I skip the lowest start?

Vault reply

The label still wants the lowest Cialis start when the alpha-blocker is already there. Feeling fine on the alpha-blocker alone is stability, not a skip.

Before you start, stop, or change any medicine, speak with your prescriber or pharmacist - they hold your chart, this vault card does not. Open the vault disclaimer.