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Tadalafil for Health & Longevity

Created on 11/04/2026 – Quick Reference based on Evidence Review created using AI4L / Opus 5.5 – Audit

Tadalafil is an inexpensive generic prescription oral medication that widens blood vessels and relaxes prostate and bladder muscle, used for erectile problems and enlarged-prostate urinary symptoms, both backed by many controlled trials. Health-record studies link it to fewer heart attacks, strokes and deaths, but no trial assigning people at random has tested survival, so the longevity claim is plausible but unproven. With nitrate heart medications, blood pressure can drop dangerously. (Full Review)

Protocol

Longevity-oriented daily low dose
2.5–5 mg once daily
The labeled daily doses for erectile dysfunction and enlarged prostate; the longevity prescribers named in the review publish no dose rationale
On-demand dosing
10 mg before sexual activity
Adjustable to 5 or 20 mg, at most once daily; effect lasts up to 36 hours
Best time of day
Approximately the same time each day
With or without food; some users shift dosing to morning or evening to place back pain conveniently
Time to effect
Erectile effect
30 minutes to 2 hours
Per dose; still requires sexual stimulation
Urinary symptoms
1–4 weeks
Daily 5 mg in prostate enlargement
Blood-vessel lining function
By 4 weeks
From one small four-week trial; clinical-outcome impact untested

Benefits

Contraindications
  • Users of any organic nitrate, regularly or intermittently (in emergencies, 48 hours between last dose and nitrates), or of guanylate cyclase stimulators such as riociguat
  • Known serious hypersensitivity to tadalafil, including prior Stevens-Johnson syndrome or exfoliative dermatitis
  • Heart attack within the last 90 days; unstable angina or angina during intercourse; NYHA Class 2 or greater heart failure within 6 months; uncontrolled arrhythmias; hypotension below 90/50 mmHg or uncontrolled hypertension; stroke within 6 months
  • Men for whom sexual activity is inadvisable because of cardiovascular status
  • Severe hepatic impairment (Child-Pugh Class C); creatinine clearance below 30 mL/min or hemodialysis for daily use
  • Hereditary degenerative retinal disorders, including retinitis pigmentosa
  • Prior sudden vision loss from optic nerve ischemia, unless anticipated benefits outweigh the risk of recurrence
  • Women who are pregnant or breastfeeding
  • Personal history of melanoma (inferred; no human evidence of harm in this group)
    •
Key Interactions
  • Alpha-blockers (doxazosin, alfuzosin): Additive blood-pressure lowering, strongest with doxazosin; avoided in enlarged-prostate treatment; for erectile dysfunction, stability on the alpha-blocker before tadalafil starts at the lowest dose
  • Antihypertensives (amlodipine, losartan): Extra 3–8 mmHg systolic reduction
  • Strong CYP3A4 inhibitors (ketoconazole, ritonavir): Higher tadalafil exposure; dose limited to 2.5 mg daily or 10 mg every 72 hours on demand
  • Grapefruit juice and erythromycin: Would likely increase tadalafil exposure
  • CYP3A4 inducers (rifampin, bosentan): Lower exposure, reduced efficacy; no dose adjustment is labeled
  • Alcohol (5 or more units): Blood-pressure drop on standing and dizziness; no interaction at lower intake
  • Other PDE5 inhibitors (sildenafil, vardenafil, Adcirca): Combination avoided; additive hypotension and side effects
  • Supplements adulterated with tadalafil or analogs ("natural" sexual-enhancement capsules, honeys): Hidden double dosing and nitrate-type hypotension risk
    •
Theoretical (inferred from mechanism)
  • L-citrulline: Possible dizziness or low blood pressure
  • Dietary nitrate supplements (beetroot juice or extract): Possible hypotension at concentrated supplement doses
  • Blood-pressure-lowering supplements (hawthorn, high-dose magnesium): Possible dizziness on standing
  • Horny goat weed (icariin) and yohimbine: Possible excess side effects
  • St. John's wort: Likely lower tadalafil levels and reduced efficacy
  • Pomegranate juice: Possible higher tadalafil levels
  • Sauna, hot baths and dehydration: Possible dizziness on standing
    •

Risk & Side Effects

  • High: Headache, flushing and nasal congestion; dyspepsia and reflux; back pain and myalgia
    •
  • Medium: Symptomatic hypotension and dizziness
    •
  • Low: Reduced sperm concentration; sudden vision loss from optic nerve ischemia; sudden sensorineural hearing loss; melanoma; cardiac events around sexual activity; priapism; serious skin and hypersensitivity reactions; retinal vascular occlusion and retinal detachment; seizures and transient global amnesia
    •
  • Speculative: Testicular effects of chronic PDE11 inhibition
    •

Monitoring

Marker Target Why
Blood pressure (seated and standing) No established target; track standing drop versus own baseline Safety check: hypotension risk
Creatinine clearance Above 50 mL/min for standard dosing Safety check: dose limit
Liver enzymes (ALT, AST) ALT about 7–55 U/L, AST about 8–48 U/L Safety check: hepatic dose limits
HbA1c About 4.0–5.6% May fall modestly in diabetes
PSA About 0–4 ng/mL Safety check: excludes prostate cancer before treating urinary symptoms
IPSS questionnaire No established target; track change from own baseline Urinary symptoms
IIEF erectile-function score No established target; track change from own baseline Erectile function
Semen analysis (if planning conception) Sperm concentration at least 16 million/mL Safety check: label reports reduced sperm concentration

Cadence: Blood pressure and side-effect review at 1–2 weeks and 4 weeks after starting or after any dose change; questionnaires at 4–12 weeks; then kidney function, liver enzymes, HbA1c and blood pressure every 6–12 months, plus an annual skin examination; sudden vision or hearing changes prompt immediate review

Qualitative Assessment

  • Erection quality, firmness and spontaneity
  • Night-time urination frequency and urinary stream
  • Headache, back pain and indigestion frequency
  • Dizziness or lightheadedness on standing
  • Any change in vision (including color tint) or hearing
  • Exercise tolerance and general energy
Not medical advice. Educational distillation of a single evidence review. Confirm any decision with a qualified clinician, especially in the presence of prescription drugs or chronic conditions.