Yohimbine blocks a natural brake on adrenaline. Its strongest evidence supports modest help for erectile difficulty; its fat-loss reputation rests on thin, mixed data, and energy or longevity claims are speculative. It reliably raises heart rate and blood pressure and can trigger anxiety. Product quality varies widely, making real-world effects hard to predict. (Full Review)

Protocol

Erectile Dysfunction

5.4 mg three times daily

~16 mg/day, continuous for several weeks

Fat Loss

~0.2 mg/kg fasted

Before morning fasted cardiovascular exercise; food avoided around dosing

Timing

Morning / pre-workout

Slow metabolizers and older adults start low, titrate cautiously; evening use discouraged

Time to effect

Erectile Response

Within ~1 hour

Continuous use over weeks to judge response

Fat Loss

Weeks

Requires consistent fasted use with exercise

Alertness

Within ~1 hour

Acute, transient stimulant effect

Benefits

Medium: Erectile dysfunction improvement

Low: Fat loss and body recomposition; antidepressant-induced sexual dysfunction; relief of orthostatic hypotension symptoms

Speculative: Cognitive alertness and focus; longevity and healthspan signaling

Contraindications

Monoamine oxidase inhibitors (MAOIs)

Cardiovascular disease, arrhythmia, or recent heart attack

Uncontrolled or moderate hypertension (≥140/90 mmHg)

Anxiety or panic disorder, post-traumatic stress disorder

Bipolar disorder or schizophrenia

Kidney disease (eGFR <60 mL/min/1.73m²)

Significant liver impairment (Child-Pugh Class B or C)

Pregnancy or breastfeeding

Key Interactions

Other stimulants/sympathomimetics (caffeine, synephrine, ephedrine, pseudoephedrine, amphetamines)

Tricyclic antidepressants and some SSRIs (fluoxetine, sertraline)

Antihypertensives (clonidine, alpha-2 agonists, beta-blockers, ACE inhibitors)

Naltrexone and other addiction/stress-research agents

Other erectogenic agents (PDE5 inhibitors such as sildenafil; intracavernosal agents)

Over-the-counter decongestants and energy/weight-loss products

Thermogenic supplement stacks (caffeine, synephrine, green-tea extract)

Risk & Side Effects

High: Anxiety, agitation, and panic; cardiovascular stimulation

Medium: Insomnia and overstimulation; gastrointestinal distress and nausea; headache and dizziness

Low: Hypertensive crisis and serious cardiac events; priapism

Speculative: Precipitation of mania or psychosis

Monitoring

Marker	Target	Why
Resting blood pressure	<120/80 mmHg	Yohimbine raises blood pressure; sets a safety baseline and stop threshold
Resting heart rate	50–70 bpm	Yohimbine is a stimulant that can cause tachycardia
Fasting glucose	70–90 mg/dL	Adrenergic stimulation can transiently raise glucose and blunt fat loss
eGFR	>90 mL/min/1.73m²	Reduced kidney clearance raises drug exposure and side-effect risk

Cadence: Before and 1–2 h after dosing during the first 1–2 weeks; then weekly for the first month; then every 3–6 months if use continues; reassess after any dose increase or new stimulant.

Qualitative Assessment

Energy and alertness: a useful lift without feeling "wired"
Anxiety and jitteriness: any rise is an early warning to reduce or stop
Sleep quality: onset and continuity should be unaffected
Erectile function (if that is the goal): improvement in firmness and reliability
Stubborn-fat and waist changes (if fat loss is the goal): slow changes over weeks

Yohimbine for Health & Longevity

Protocol

Benefits

Risk & Side Effects

Monitoring

Qualitative Assessment