Phenylpiracetam vs Semax
Moderate Research vs Well Studied
monitor Mechanism-based · 51% Both Phenylpiracetam and Semax can raise blood pressure. Monitor BP regularly and consider adding cardiovascular support (cardarine, telmisartan, or similar).
Molecular Data
Phenylpiracetam Semax
Weight 218.25 Da 813.93 Da
Half-life ~3-5 hours 0.5-2 hours
Chain — 7 amino acids
Type Racetam derivative (C12H14N2O2) ACTH(4-10) synthetic analog
Key Benefits
Phenylpiracetam
01 Potent cognitive enhancement including improved memory, focus, and information processing speed
02 Psychostimulant properties that increase motivation, mental energy, and alertness without the jitteriness of classical stimulants
03 Physical performance enhancement through improved stamina, reduced perception of effort, and increased exercise tolerance
04 Enhanced cold tolerance -- a unique property among nootropics, originally developed for extreme-environment performance
05 Anxiolytic effects at standard doses, reducing stress reactivity without sedation
06 Anticonvulsant activity demonstrated in preclinical models
Semax
01 Rapid brain delivery via intranasal route
02 Rapidly increases BDNF levels
03 Extensive clinical research in Russia
04 Easy self-administration
05 Modulates dopamine and serotonin systems
06 Neuroprotective effects
Dosing Protocols
Phenylpiracetam
100-200 mg, 1-2x/day / Once or twice daily (morning, or morning and early afternoon)
Semax
300-600mcg per dose (up to 1000mcg for intensive use) / 1-2x daily (morning recommended for cognitive boost)
Research protocol 500-750mcg 1x daily
Intensive protocol 750-1000mcg 1-2x daily
Side Effects
Phenylpiracetam
Insomnia, particularly if taken in the afternoon or evening -- the stimulant effects can persist for several hours after dosing
Irritability and overstimulation, especially at higher doses or when combined with other stimulants
Headache, most commonly caused by increased acetylcholine demand without adequate choline supplementation
Rapid tolerance development -- the most significant practical limitation, requiring intermittent dosing schedules to maintain efficacy
Semax
Mild nasal discomfort (nasal route)
Possible nasal sensation upon administration
Contraindications
Known hypersensitivity to phenylpiracetam or other racetams
Severe hypertension or cardiovascular disease (due to stimulant properties)
Pregnancy and breastfeeding (insufficient safety data)
Severe hepatic or renal impairment
Competitive athletes subject to WADA testing (phenylpiracetam is a prohibited substance under Section S6: Stimulants)
Pregnancy or breastfeeding
Known peptide allergies
Do not exceed 4-week continuous use without medical supervision
Research Evidence
Phenylpiracetam Semax
Status Moderate Research Well Studied
References 5 studies 5 studies
Latest — 2025
FDA Approved No No
This comparison is for educational and research purposes only. Consult a healthcare professional before use.