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Probe · sildenafil · 3 min read

What if an erection lasts more than 4 hours on Viagra?

An erection that lasts more than 4 hours needs immediate medical help. Priapism - a painful erection longer than 6 hours - has been reported infrequently since approval. If it is not treated at once, penile tissue damage and permanent loss of potency can follow. The row sits on 25 mg and 50 mg, not only on 100 mg. Sickle cell disease, myeloma, leukemia, and penile deformity raise the caution.

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

Last reviewed

Updated

01What four hours of erection requires

Forest-green still life: red thread around a four-hour glass, blue tablet

Seek immediate medical assistance. That is the insert's sentence. Waiting overnight is the injury.

Tell the team that sildenafil was taken and at which hour.

02When to stop waiting at home

At 4 hours, go in. Ice and 'walk it off' advice from a forum is not the insert.

Vision or hearing: stop and call is the other same-day pair. Chest pain on a nitrate is a third.

03Who the caution list already flags

Use caution if the penis is deformed (angulation, cavernosal fibrosis, Peyronie's) or if sickle cell anemia, multiple myeloma, or leukemia raises priapism risk. There are no controlled data in sickle cell or related anemias.

Those men still need the 4-hour rule if an erection will not fade.

04Why 25 mg does not cancel the emergency

A directed 25 mg start does not create a safe-to-wait stamp. The warning is not strength-specific.

Nitrates and this 4-hour stop sit together on the sildenafil 25-50 mg vault.

05How priapism past six hours is named

The warning names prolonged erection greater than 4 hours and priapism (painful erections greater than 6 hours). Both are infrequent in the post-marketing row. Infrequent is not 'ignore it'.

Pain is not required to leave at 4 hours. The 4-hour mark is already the go.

06What potency loss the label warns

Untreated priapism can damage tissue and permanently reduce potency. That is why the 4-hour mark exists.

This page will not add a home procedure.

Sources

  1. DailyMed Viagra (sildenafil) prescribing information - Warnings 5.2: >4 h seek help; priapism >6 h; caution list.

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

Vault consult

Answers follow the U.S. Viagra label.

Gustav K. Three hours and still hard after 50 mg. Wait till morning?

Vault reply

If it is still there at 4 hours, go in. Do not wait until morning.

Elise C. I only take 25 mg. Same 4-hour rule?

Vault reply

Yes. The warning is not limited to 100 mg.

Tariq H. Peyronie's on my chart. Can I use 50 mg?

Vault reply

The insert says use with caution in penile deformity. That is a prescriber talk, not a cart decision. The 4-hour emergency still applies.

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.