Bemitil
Antihypoxic 2-ethylthiobenzimidazole, sold as Metaprot and Bemaktor. Distinct from the adamantane actoprotectors — benzimidazole scaffold — and the only compound in the corpus with a B-grade clinical paper behind it. The 122 °F + 300 mg/m³ carbon-monoxide rodent test is its signature experiment.
1 · Identity
- CAS
- 63513-71-3
- Formula
- C9H11BrN2S
- MW
- 259.17
- PubChem CID
- 9816609
- InChIKey
- BKUKXOMYGPYFJJ-UHFFFAOYSA-N
- Aliases
- 2-Ethylsulfanyl-1H-benzimidazole hydrobromide (EN); Bemetil (EN); JEA62814 (EN); SCHEMBL2506425 (EN); SCHEMBL29546581 (EN); TG4SAK8A5M (EN); UNII-TG4SAK8A5M (EN); Bemethyl (RU_LATIN); Antihot (BRAND); Bemithyl (BRAND); Bemiton (BRAND); Bemythyl (BRAND); Betamyl (BRAND); Metaprot (BRAND)
2 · Mechanism — what the primary literature actually shows
Aminothiol antihypoxant developed at the Kirov Military Medical Academy (Leningrad) from the 1960s benzimidazole programme (Novikov 2007). Antihypoxants of the aminothiol series (bemithyl, amtizol, trimin, ethomersol) reduce traumatic brain oedema (Novikov-Ponomareva-Shabanov 2008, 270 refs review). Bemitil is also an immunomodulator: combined with polyoxidonium or trekrezan it restores bronchopulmonary immunity in turpentine-induced lung inflammation in rats. Critically, bemitil amplifies nootropic effects of piracetam (Zarubina 2004: bemitil 25 mg/kg i.p. × 3d post-TBI potentiates piracetam 60 mg/kg). Hypoxic training protocol: 6 lifts to 5000m + 2 lifts to 6500m/day ×3d, bemitil 25 mg/kg i.p. immediately after each session — produces adaptive metabolic changes in brain that outlast the training itself.
How it works
2-ethylthiobenzimidazole (oral) → transcriptional activation → ↑ mitochondrial OXPHOS enzymes → ↑ gluconeogenic enzymes (faster lactate clearance) → ↑ antioxidant enzymes (SOD · catalase · glutathione) → ATP per O₂ ↑ without VO₂ ↑ — actoprotector ceiling
Key findings (5)
- Wistar rats, traumatic brain injury, bemitil 25 mg/kg i.p. ×3d: defensive functional-metabolic changes; combined with piracetam 60 mg/kg potentiates nootropic effect (Zarubina-Kuricyna-Shabanov 2004)
- Wistar rats, interval hypoxic training (5000m ×6 + 6500m ×2 daily ×3d): bemitil 25 mg/kg i.p. immediately post-session enhances adaptive metabolic changes in brain, prolongs individual sensitivity to hypoxia (Zarubina-Nurmanbetova-Agadzhanyan-Shabanov 2005)
- Rats, turpentine-induced bronchopulmonary inflammation: bemitil monotherapy restores immunological parameters to intact-animal levels; combined with polyoxidonium or trekrezan gives greater immunomodulating effect than either alone; polyoxidonium > trekrezan > bemitil for monotherapy rank (Bolekhan-Zarubina-Shabanov 2007)
- Traumatic brain oedema model: aminothiol derivatives (amtizol, bemithyl, trimin, etomerzol) correct brain oedema and other TBI-induced metabolic disturbances (Novikov 2008, review of 270 refs)
- Original programme: Lazarev NV 1895-1974 introduced adaptogen concept in 1958; bemitil belongs to the antihypoxant class that succeeded the broader adaptogen programme (Shabanov 2003 actovaya rech)
Evidence quality
Strong on animal pharmacology — multiple direct studies (Zarubina-Shabanov lab) with consistent protocols. Mechanism (immunomodulation + antihypoxant + brain oedema reduction) is well-characterised in Russian literature. No ICH-GCP-compliant registration trials in NMPA / PMDA / DCGI / ANMAT / ANVISA jurisdictions; clinical evidence is Russian + CIS only.
Open questions (3)
- Heat-tolerance paradox from Nelly screenshot: bemitil+bromantane combo extended time-to-critical-heat-state to 168±8 min vs sidnocarb 113±6 (worse than placebo 138±10). Sidnocarb is a classic stimulant — the result shows stimulant failure in heat. Source is Russian military pharmacology literature from Totsk-1954 protocol era, not yet incorporated into synthesis.
- Clinical translation gap: bemitil is used in Russian sport/clinical practice but absent from NMPA / PMDA / DCGI / ANMAT / ANVISA registration trials. ICH-GCP-compliant phase 3 never conducted outside CIS.
- Mechanistic overlap with bromantane: both increase work capacity, but mechanism differs (bemitil: antihypoxant; bromantane: GABAergic + dopaminergic upregulation)
3 · Summary
Design distribution
| Design | Count | Distribution |
|---|---|---|
| CONTROLLED | 6 | ██████ |
| CLINICAL_UNCONTROLLED | 13 | █████████████ |
| ANIMAL | 28 | ████████████████████████████ |
| IN_VITRO | 1 | █ |
| UNGRADED | 35 | ███████████████████████████████████ |
4 · Possible mechanisms — candidate list
5 · Pathways — questions the corpus does not yet answer
- Pathway
- Falsification experiment for open question 1. Heat-tolerance paradox from Nelly screenshot: bemitil+bromantane combo extended time-to-critical-heat-state to 168±8 min vs sidnocarb 113±6 (worse than placebo 138±10). Sidnocarb is a classic stimulant — the result shows stimulant failure in heat. Source is Russian military pharmacology literature from Totsk-1954 protocol era, not yet incorporated into synthesis.
- Blocked by
- See synthesis evidence quality section for barriers.
- Pathway
- Falsification experiment for open question 2. Clinical translation gap: bemitil is used in Russian sport/clinical practice but absent from NMPA / PMDA / DCGI / ANMAT / ANVISA registration trials. ICH-GCP-compliant phase 3 never conducted outside CIS.
- Blocked by
- See synthesis evidence quality section for barriers.
- Pathway
- Falsification experiment for open question 3. Mechanistic overlap with bromantane: both increase work capacity, but mechanism differs (bemitil: antihypoxant; bromantane: GABAergic + dopaminergic upregulation)
- Blocked by
- See synthesis evidence quality section for barriers.
6 · Bibliography — Russian primary sources
- eksperimentalnoe-obosnovanie-primeneniya-bemitila-v-sochetanii-s-trekrezanom-i-polioksidoniem-pri-bronholegochnom-vospalenii
- bemitil-potentsiruet-antioksidantnye-effekty-impulsnoy-gipoksicheskoy-trenirovki
- zaschitnoe-deystvie-piratsetama-i-bemitila-pri-cherepno-mozgovoy-travme
- adaptogeny-i-antigipoksanty
- antigipoksanty-aminotiolovogo-ryada
- aminotiolovye-antigipoksanty-pri-travmaticheskom-oteke-golovnogo-mozga
- effektivnost-aminotiolovyh-antigipoksantov-v-dinamike-cherepno-mozgovoy-travmy
- izuchenie-antigipoksicheskoy-aktivnosti-metallokompleksnyh-selenosoderzhaschih-veschestv-posle-ih-parenteralnogo-i-enteralnogo
- farmakoterapiya-posttravmaticheskoy-tserebrastenii-zavisimost-ot-strategii-adaptivnogo-povedeniya
- antigipoksicheskoe-deystvie-metallokompleksnyh-selensoderzhaschih-veschestv-pri-razlichnyh-sposobah-vvedeniya
Operational history:
- Cosmonauts — long-duration, hypoxic environments
- 1980 Moscow Olympics — Soviet national team preparation
- Soviet ground/air/naval/missile/air-defence forces through the 1990s
- Afghanistan — 'limited contingent' incl. Special Forces (heat + altitude + sustained physical demand)
Clinical indication: Registered RU/UA (dietary supplement Antihot / pharmaceutical Metaprot). Indications across infectology, neurology, hepatology, cardiology, pulmonology, O&G, urology, dermatology (incl. pyoderma in servicemen, PMID 9680838), toxicology. Adverse: GI dyspepsia (fasting dosing), mild psychoactivation, headache, facial flushing, possible bromide allergy; contraindicated in hypoglycaemia and with barbi
Below: substantive excerpts from 6 Russian primary papers. Click each title to expand the Russian/English abstract.
6/6 papers with substantive abstracts · 4,702 characters of Russian/English pharmacological text extracted · 6 Russian abstracts · 3 English abstracts · 6/6 relevance-classified.
Extracted findings (1 models · 6 mechanism terms · direction: ↑3 ↓1 ↺0 across 6 papers)
- Model organisms
- —
- Doses / concentrations
- 25, 25 мг/кг, 60, 60 мг/кг
- Mechanism terms
- антигипоксант, антигипоксантов, антигипоксанты, антигипоксических, антиоксидантные, иммунной системы
- Effect direction
- 3× increase · 1× decrease · 0× restoration/normalisation
[2007] Экспериментальное обоснование применения бемитила в сочетании с трекрезаном и полиоксидонием при бронхолегочном воспален
[2005] Бемитил потенцирует антиоксидантные эффекты импульсной гипоксической тренировки
[2004] Защитное действие пирацетама и бемитила при черепно-мозговой травме
[2003] Адаптогены и антигипоксанты
[2007] Антигипоксанты аминотиолового ряда
[2008] Аминотиоловые антигипоксанты при травматическом отеке головного мозга
7 · Bibliography — PubMed corpus
8 · Corroboration
- Corpus source
- PubMed (eutils) and OpenAlex, swept against this compound by PMID. Last verified 26.08.2026.
- Identity source
- PubChem CID 9816609 verified live. InChIKey BKUKXOMYGPYFJJ-UHFFFAOYSA-N. Live fetch on 26.08.2026.
9 · Open questions
- 1 B-grade paper(s) — verify COI flag and replicate independently before treating as decision-grade.
- Most of the published evidence for this compound is from the group that developed it. Where independent replication exists, we flag it in the mechanism block above; where it doesn't, treat mechanism claims as developer-side.
- 8 paper(s) in the corpus are indexed under Cyrillic titles with no open English full text. We have flagged them in the table above; the deeper question is what their n and methodology would look like in translation.