Alprostadil, what the science actually shows

Alprostadil is a synthetic form of prostaglandin E1 (PGE1) FDA-approved for erectile dysfunction and maintaining ductus arteriosus patency in neonates. Evidence base: extensive human RCT data for erectile dysfunction; 5-star evidence for the approved indication.

Synthetic prostaglandin E1, FDA-approved since 1995 for ED. Works through a completely different mechanism than Viagra/Cialis. Important option for men who don't respond to PDE5 inhibitors.

Evidence
★★★★★ Robust
Type
Prostaglandin
Structure
Prostaglandin (lipid mediator)

What alprostadil is

Synthetic form of prostaglandin E1 (PGE1). While technically a prostaglandin rather than a peptide, included due to clinical relevance alongside peptide therapies. FDA-approved for ED as Caverject (injection, 1995) and MUSE (urethral pellet, 1997). Also approved for neonatal cardiac defects.

Mechanism, in plain English

Binds EP2 and EP4 receptors on penile smooth muscle cells, activating adenylate cyclase and increasing cAMP. This relaxes smooth muscle, dilates arteries, and produces erection. Direct-acting, works regardless of sexual arousal or nerve function. PDE5 inhibitors require intact nerve signaling; alprostadil bypasses that entirely.

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What the evidence shows

Caverject: 70-80% success rate, including in men who failed PDE5 inhibitors. Erection in 5-20 minutes, lasting 30-60 minutes. MUSE: 43-65% success but non-injectable. Works in neurogenic ED (spinal cord injury, post-prostatectomy). Combination with PDE5 inhibitors shows synergy.

FDA status

FDA-approved. Caverject (1995), MUSE (1997), Prostin VR (neonatal).

Common synonyms

Alprostadil, prostaglandin E1, PGE1, Caverject, MUSE, Edex

Safety and adverse-event landscape

Penile pain (37% injection), prolonged erection/priapism (1-4%, seek medical attention if >4 hours), urethral burning with MUSE. Injection site fibrosis with long-term use.

Frequently asked questions

Technically no, it is a prostaglandin. Included for clinical importance alongside peptide therapies.
When PDE5 inhibitors fail, in neurogenic ED, post-prostatectomy, or patients taking nitrates.
Yes. Both Caverject and MUSE require medical evaluation and injection training.
No. Peptexa is educational only.

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