Have you encountered a prolonged painful erection (hard‑flaccid) after taking a high dose of sildenafil (60 mg) on top of daily tadalafil (5 mg) and an additional tadalafil dose (10 mg)?

Prolonged Erection from Combined PDE5 Inhibitor Use

Yes, prolonged erections from combining high-dose sildenafil (60 mg) with daily tadalafil (5 mg) plus additional tadalafil (10 mg) are a recognized and concerning phenomenon, though the specific "hard-flaccid" presentation you describe is not a standard clinical entity in the medical literature.

Understanding the Clinical Scenario

The combination you describe represents a significant overdose scenario with multiple PDE5 inhibitors:

• Total tadalafil exposure: 15 mg in one day (5 mg daily + 10 mg additional)
• Sildenafil: 60 mg (exceeding the typical 50 mg maximum recommended dose for erectile dysfunction)
• Combined effect: Additive vasodilation and prolonged erectile response

What the Evidence Shows About Combined PDE5 Inhibitor Use

Priapism and prolonged erection risk is real but relatively low even with combination therapy. Research on post-prostatectomy patients using daily tadalafil 5 mg or sildenafil 25 mg combined with intracavernosal injections showed 1:

• Priapism (≥4 hours): 1.7% with tadalafil, 1.4% with sildenafil
• Prolonged erections (≥2 hours): 6.3% with tadalafil, 3.3% with sildenafil
• 53% of prolonged erections occurred within the first 6 home injections

However, your scenario differs critically—you're describing oral PDE5 inhibitor stacking, not combination with intracavernosal therapy.

Immediate Management Algorithm

If Erection Duration <4 Hours:

1. Conservative measures first 2, 3:

   • Apply ice to the penis
   • Exercise/physical activity
   • Attempt ejaculation
   • Lie supine

2. If fully rigid and approaching 4 hours: Proceed directly to medical evaluation

If Erection Duration ≥4 Hours:

This is a medical emergency requiring immediate intervention 2, 3:

1. Present to emergency department immediately
2. First-line treatment: Intracavernosal phenylephrine injection 2, 3
   • Monitor blood pressure and heart rate during administration
   • Especially critical given the high PDE5 inhibitor load
3. If phenylephrine fails: Aspiration with saline irrigation
4. If >36 hours: Surgical shunting may be required, though permanent erectile dysfunction becomes likely

Critical Distinctions About Your Presentation

The "hard-flaccid" syndrome you describe is not well-characterized in formal medical literature as a complication of PDE5 inhibitor use. The established complications are:

• True priapism: Fully rigid, painful erection ≥4 hours
• Prolonged erection: Fully rigid erection 2-4 hours
• Partial erections: Not counted toward the 4-hour threshold 2, 3

Pain is not a reliable indicator of ischemic priapism, as discomfort can occur from engorgement alone 2, 3.

Why This Combination Is Problematic

The FDA labeling for sildenafil explicitly warns about erections lasting several hours and advises telling your doctor immediately if an erection lasts >4 hours 4. At higher doses than recommended (your 60 mg sildenafil exceeds typical dosing), there is greater incidence of adverse reactions 4.

Combining PDE5 inhibitors is off-label and potentially dangerous:

• Tadalafil has a 17.5-hour half-life
• Your 15 mg total tadalafil dose creates sustained PDE5 inhibition
• Adding 60 mg sildenafil creates peak additive effect
• This combination amplifies both efficacy and adverse effects

Common Pitfalls to Avoid

1. Do not dismiss partial rigidity: While guidelines state partial erections shouldn't count toward 4-hour criteria, any concerning prolonged tumescence warrants evaluation
2. Do not delay seeking care: Permanent erectile dysfunction occurs with ischemic priapism >36 hours, with smooth muscle damage starting as early as 6 hours 3
3. Do not repeat this dosing combination: The risk-benefit ratio is unfavorable

Moving Forward

If you are currently experiencing a prolonged erection: Seek emergency medical care immediately if duration approaches or exceeds 4 hours with full rigidity.

For future erectile dysfunction management: Combination PDE5 inhibitor therapy (tadalafil + sildenafil) has been studied at much lower doses (tadalafil 5 mg daily + sildenafil 50 mg as needed) with acceptable safety profiles 5, but your dosing far exceeds studied protocols. Work with a urologist to establish a safe, evidence-based regimen rather than self-titrating multiple agents.