Yohimbine blocks nervous-system brake receptors, boosting fight-or-flight signaling. It modestly improves erectile function and modestly releases stored fat, mainly in already-lean people taking it fasted. The same stimulation reliably raises blood pressure, heart rate, and anxiety, with a narrow safety margin worsened by supplement products of highly unreliable potency. (Full Review)

Protocol

Standard Dose

~0.2 mg/kg/day

Fat-loss approach: split into two doses, taken fasted or between meals (e.g. ~7 mg twice daily for 68 kg)

Best Time of Day

Earlier in the day

Or before fasted exercise; late-day dosing risks insomnia and nighttime anxiety

Dosing Pattern

Split, twice daily

Sustains effect across the day given the short half-life and keeps each dose's cardiovascular impact lower

Time to effect

Erectile Function

Several weeks

Erectile-function benefits in trials were assessed over several weeks

Body-Composition Change

~3 weeks

Body-composition changes in controlled studies emerged over about three weeks of consistent use

Acute Effects

30–60 minutes

Alertness, raised heart rate, and fat mobilization begin within roughly 30–60 minutes

Benefits

Medium: Erectile function improvement; fat mass reduction

Low: Reduced stress-related eating relapse

Speculative: Exercise performance and sympathetic "energy" effects

Contraindications

Concurrent MAOIs

Hypertension (especially uncontrolled, ≥140/90 mmHg)

Coronary artery disease, recent heart attack, arrhythmia, heart failure (NYHA III–IV)

Anxiety disorders, panic disorder, PTSD, bipolar disorder

Significant liver or kidney impairment

Pregnancy or breastfeeding

Key Interactions

Antihypertensive and blood-pressure-lowering drugs

Stimulants and sympathomimetics (caffeine, ephedrine, pseudoephedrine, amphetamines)

CYP2D6 inhibitors (fluoxetine, paroxetine, bupropion, quinidine)

Tricyclic antidepressants and other serotonergic/noradrenergic agents

OTC decongestants and "energy"/pre-workout products

Sympathomimetic supplements (synephrine/bitter orange, high-dose green tea extract, rauwolscine, higenamine)

Naloxone and opioid-related agents

Risk & Side Effects

High: Elevated blood pressure and heart rate; anxiety, agitation, and psychiatric activation

Medium: Gastrointestinal and autonomic symptoms; serious cardiovascular and neurological events

Low: Hepatic and idiosyncratic reactions

Speculative: Risks from product adulteration and contamination

Monitoring

Marker	Target	Why
Resting blood pressure	~110–125 / 70–80 mmHg	Yohimbine raises blood pressure; baseline and on-treatment values define safety
Resting heart rate	~55–75 bpm	Detects tachycardia from sympathetic activation
Fasting glucose (optional)	~70–90 mg/dL	Context for fat-loss use and metabolic status
Liver enzymes (ALT/AST, optional)	Within or below conventional range	Screens for rare hepatic effects with extended use

Cadence: Check before the first dose, again during the first week, then periodically (weekly during initial titration, then as needed)

Qualitative Assessment

Sleep quality and time to fall asleep
Daytime anxiety, jitteriness, or palpitations
Energy and perceived alertness
For fat-loss goals: changes in body-fat distribution and waist measurements
For sexual-function goals: subjective erectile response

Yohimbine for Health & Longevity

Protocol

Benefits

Risk & Side Effects

Monitoring

Qualitative Assessment