Modafinil for Health & Longevity - Quick Reference Sheet
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Modafinil for Health & Longevity

Created on 08/30/2026 – Quick Reference based on Evidence Review created using AI4L / Opus 5 – Audit

A prescription wakefulness drug narrower in effect than its reputation. Where sleepiness or fatigue is present it lifts alertness and lowers fatigue; in rested adults the gain in thinking is small. Headache, nausea, appetite loss and restlessness are common, disrupted sleep is the strongest signal, pregnancy a hard stop. (Full Review)

Protocol

Standard sleep-medicine protocol
200 mg once daily
On waking; titrated to 400 mg only if 200 mg fails
Best time of day
On waking, never after 10:00
Shift workers take the dose one hour before the shift starts
Competing low-dose off-label approach
50–100 mg, 2–3 days weekly
Used by longevity-oriented practitioners; untested against standard dosing
Time to effect
Wakefulness
30–60 minutes
From the first dose; peaks at 2–4 hours, no loading period needed
Fatigue and mood benefits
2–4 weeks
Time taken in trials to reach their full size
Steady state
2–4 days
Half-life roughly 12–15 hours, so timing matters more than dose

Benefits

Contraindications
  • Pregnancy, or conception planned within one cycle
  • Breastfeeding
  • Prior hypersensitivity or rash on modafinil/armodafinil
  • Myocardial infarction <90 days, unstable angina, mitral valve prolapse
  • Left ventricular hypertrophy or ischaemic changes
  • Uncontrolled hypertension above 160/100 mmHg
  • Severe hepatic impairment (Child–Pugh Class C)
  • Active psychosis, mania, or prior stimulant psychosis
  • Current or recent stimulant use disorder
    •
Key Interactions
  • CYP3A4 substrates (contraceptives, ciclosporin)
  • CYP2C19 substrates (omeprazole, diazepam)
  • Warfarin
  • Monoamine oxidase inhibitors (phenelzine)
  • Other stimulants (methylphenidate, caffeine)
  • Over-the-counter medications (pseudoephedrine, sedating antihistamines)
  • Stimulant supplements (caffeine, yohimbine)
  • Sedative supplements (melatonin, valerian)
  • St John's wort
  • Alcohol and continuous positive airway pressure
    •

Risk & Side Effects

  • High: Headache; insomnia; anxiety and nervousness; nausea and reduced appetite
    •
  • Medium: Raised heart rate and blood pressure; birth defects in pregnancy; reduced contraceptive cover
    •
  • Low: Serious skin reactions; psychosis and mania; dependence and compulsive use
    •
  • Speculative: Masking of accumulated sleep debt and impaired learning consolidation
    •

Monitoring

Marker Target Why
Blood pressure 105–120 / 65–80 mmHg Detects the documented sympathetic rise
Resting heart rate 50–70 bpm More responsive than blood pressure
Electrocardiogram Normal tracing, no hypertrophy or ischaemia Screens for structural findings that raise the risk
Liver enzymes Alanine aminotransferase 10–26 (women), 10–33 U/L (men) Clearance is hepatic; impairment doubles exposure
Kidney function Above 90 mL/min/1.73 m² Severe impairment accumulates the metabolite
Epworth Sleepiness Scale 0–5 points on the 24-point scale The primary trial efficacy endpoint
Sleep duration and efficiency At least 7 hours, efficiency above 85% Detects masked sleep debt
Body weight Within 2% of pre-treatment weight Tracks appetite suppression

Cadence: Baseline, one week, four weeks, then every three to six months; blood pressure and heart rate at every contact, bloodwork annually.

Qualitative Assessment

  • Sleep quality: time to fall asleep, night awakenings, mornings restored or merely medicated
  • Energy pattern: alertness smooth across the day, or spikes and drops
  • Cognitive clarity: starting difficult work, and whether flexible or creative thinking feels narrowed
  • Mood and irritability: emotional flatness, agitation, or afternoon irritability
  • Appetite and meal completion: meals skipped rather than chosen
  • Drug-free week performance: function unmedicated versus the pre-treatment baseline
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.