ACTH(4–10) is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Updated 2026-02-06. Numbers and descriptions here follow the published literature rather than marketing material.
Published research has focused mainly on neurological and cognitive endpoints in animal models, with proposed mechanisms involving brain-derived neurotrophic factor and related signalling pathways. A substantial share of the human data originates from a limited number of research groups, and independent replication in other countries remains sparse. Regulatory status reflects that distribution: the peptide is registered as a medicine in Russia and appears in some neighbouring markets, while elsewhere it is handled as a research chemical without approved therapeutic labelling. Questions about dose-response relationships, long-term effects, and comparability across studies are still open.
Lyophilised powder is normally kept at -20 °C in a desiccated container, with some suppliers recommending -80 °C for long-term archival storage. Repeated freeze-thaw cycles are the most common cause of avoidable loss, so aliquoting before freezing reduces variability between working sessions. Dissolved peptide is far less stable than the dry solid and is usually prepared fresh or held briefly at 4 °C. Aqueous solutions support both hydrolysis of the backbone and oxidation of the N-terminal methionine, and these two routes dominate degradation under ordinary laboratory conditions.
Identity and purity are confirmed with reversed-phase high-performance liquid chromatography, typically monitored at 214 nanometres where the peptide bond absorbs. Mass spectrometry, either electrospray or MALDI-TOF, verifies molecular mass against the theoretical value and detects truncation or adduct formation. Amino acid analysis and peptide mapping provide additional confirmation when required. The most frequently reported impurities are deletion sequences from incomplete coupling, methionine sulfoxide from oxidation, and dimeric species formed through non-covalent aggregation. Impurity profiles depend strongly on the synthesis and purification route chosen by the producer.
Clinical reports describe use in ischaemic stroke, transient ischaemic attack, optic nerve conditions, and cognitive complaints, but most of these studies are small and were conducted in a single region. Systematic reviews have generally described the evidence base as limited in size and variable in methodological quality. Randomised controlled data suitable for international regulatory assessment are scarce. As a result, major treatment guidelines outside Russia do not include the peptide, and interest in it remains largely research-driven rather than routine clinical.
Semax is a synthetic heptapeptide with the sequence Met-Glu-His-Phe-Pro-Gly-Pro. It is described in the literature as an analogue of the ACTH(4–10) fragment, a short N-terminal portion of adrenocorticotropic hormone that retains some neurotropic activity without the full hormonal effects of the parent peptide. The molecule carries a methionine residue at the N-terminus and two proline residues near the C-terminus, features that shape both its interactions with receptor systems and its chemical stability. The free peptide corresponds to the formula C37H51N9O10S and a molecular mass near 813.9 Da.
The compound was developed in the 1980s at the Institute of Molecular Genetics in Moscow, where it emerged from research on short ACTH fragments and their effects on the central nervous system. Russian pharmaceutical listings describe it as a nootropic and neuroprotective agent, most often formulated as nasal drops. It is not a marketed medicine in the United States or the European Union, and no pharmacopoeial monograph covers it. Consequently, most published clinical experience with the substance originates from a small number of research centres, mainly in Russia and neighbouring countries.
| Property | Value | Notes |
|---|---|---|
| Purity assay | RP-HPLC, UV 214 nm | Typical research grade 95 percent or higher |
| Mass confirmation | ESI-MS or MALDI-TOF | Compared with theoretical value |
| Main degradation route | Methionine oxidation | Sulfoxide formation in solution |
| Powder storage | -20 °C, desiccated | Amber vial, minimal headspace |
| Working solution | Sterile water or saline | Prepare fresh; avoid repeated thawing |
Dissolution is normally performed in water, phosphate-buffered saline, or normal saline, since the peptide is freely soluble in aqueous media and is rarely handled with strong organic solvents. Solution pH should be kept near neutral, because extreme acidity or alkalinity accelerates backbone hydrolysis and encourages oxidation of the methionine side chain. Once dissolved, the material is less stable than the dry powder and is commonly divided into single-use portions and frozen. Buffers containing primary amines, such as Tris, are often avoided because of possible side reactions.
Purity assessment relies mainly on reversed-phase high-performance liquid chromatography, which separates the target heptapeptide from truncated sequences, deletion analogues, and oxidised forms. Mass spectrometry, usually coupled to liquid chromatography, confirms identity through the expected molecular ion and reveals modifications such as methionine sulfoxide formation. Amino acid analysis can verify composition, and tandem mass spectrometry supports sequence confirmation. Ultraviolet detection near 254 to 280 nanometres is convenient because the phenylalanine and histidine residues absorb in that region. Nuclear magnetic resonance is rarely used for routine release testing.
Common degradation pathways include oxidation of the methionine side chain, hydrolysis of the peptide backbone, and aggregation under unfavourable pH or concentration. Stability studies typically monitor the main peak by chromatography and report total related substances as a percentage. Because no official monograph exists, acceptance criteria vary between laboratories, and reported purity values are not directly comparable across suppliers. Analysts therefore document the method, column, and detection wavelength alongside each result, and open questions remain about how much biological activity the oxidised forms retain.
Regulatory status varies sharply by country. Semax is registered for medical use in Russia, where it appears in formularies as a nasal solution, and it also holds registration in a small number of neighbouring states. It has no approval from the United States Food and Drug Administration or the European Medicines Agency, and it is not a scheduled controlled substance in most jurisdictions. Elsewhere it circulates mainly as laboratory material, so purity documentation comes from suppliers rather than from a national pharmacopoeia.
Semax is a synthetic peptide created in the Soviet Union during the early 1980s by researchers working in Moscow. It was built from the short adrenocorticotropic hormone fragment known as ACTH(4-10), and the chain was then extended with three additional amino acids. The resulting molecule was named semax and entered clinical use in Russia in 1994. It is generally described as a nootropic and neuroprotective agent rather than as a hormone analogue.
The parent fragment ACTH(4-10) carries the sequence Met-Glu-His-Phe-Arg-Trp-Gly. Semax replaces the arginine and tryptophan positions with a proline-glycine-proline tail, giving Met-Glu-His-Phe-Pro-Gly-Pro. That change removes residues associated with adrenal stimulation, so the peptide does not drive cortisol release the way full ACTH does. This distinction shapes how the compound is grouped in the literature, where it sits with neuropeptides and peptide neuromodulators rather than with corticosteroids.
Published studies examine a fairly narrow set of endpoints. Rodent experiments commonly measure maze learning, infarct volume after induced ischemia, and tissue levels of neurotrophic factors. Clinical reports from Russian centres describe attention, memory and recovery scores in patients after stroke or transient ischemic attack. Most of those human studies are small and few have been repeated by independent groups. Outcome measures differ between studies, which limits direct comparison.
Circulation time for the peptide is short because peptidases cleave it readily. The Pro-Gly-Pro tail is thought to slow breakdown compared with the bare ACTH fragment, but the gain appears modest. Absorption after intranasal dosing is limited, and only a fraction of a dose is expected to reach the central nervous system. Laboratory concentrations therefore sit well above levels achieved systemically, a gap that complicates translation from bench findings to clinical claims.
The mechanisms attributed to semax are inferred from animal and cell studies rather than traced to one confirmed target. The most frequently cited pathway involves increased expression of brain-derived neurotrophic factor and nerve growth factor in hippocampal and cortical tissue. Some work points to engagement of melanocortin receptors, particularly MC4, which the parent ACTH fragment can activate. Effects on dopaminergic and serotonergic signalling have also been reported. No single account explains all observed results, and the relative weight of each pathway remains unsettled.
Laboratory work points toward modulation of neurotrophic signaling, particularly expression of brain-derived neurotrophic factor and nerve growth factor in hippocampal tissue. Studies also describe effects on monoamine turnover, inflammatory mediators, and oxidative markers. These observations come mainly from animal models and cultured cells, so the causal chain in humans is not firmly established. Whether the reported molecular changes translate into measurable clinical benefit is an open question. Reviews generally present the mechanism as plausible rather than demonstrated.
Clinical evidence consists largely of small trials with modest sample sizes, often without independent replication. Reported endpoints include cognitive scores, recovery after stroke, and visual function, but study designs vary widely and few trials meet contemporary reporting standards. Systematic reviewers have noted a high risk of bias in several of these reports. No large multicenter trial conducted outside Russia has been published. The compound is therefore best described as investigational in most jurisdictions, with its clinical role still unresolved.
Denzel (Hrsg.): Handbuch globale Handelsräume und Handelsrouten. Von der Antike bis zur Gegenwart. Berlin/Boston 2024. ISBN 978-3-11-043757-7, S. 261–303. The BACC II Author Team (2015): Second Assessment of Climate Change for the Baltic Sea Basin. Springer Cham. 2015. ISBN 978-3-319-16005-4. doi:10.1007/978-3-319-16006-1. Free PDF. Jann M. Witt: Die Ostsee. Schauplatz der Geschichte. BeBra Verlag, Berlin 2025, ISBN 978-3-89809-271-5.
Oxycodon (auch Dihydrohydroxycodeinon) ist ein stark wirkendes semisynthetisches Opioid mit hohem Suchtpotenzial, das vor allem als Schmerzmittel bei starken Schmerzen des Menschen angewendet wird. Es wirkt an den μ-, κ- und δ-Opioidrezeptoren in Gehirn, Rückenmark und Organen. Die Schmerzlinderung setzt in der Regel innerhalb von 15 Minuten ein und hält bei retardierter Freisetzung bis zu 12 Stunden an. Häufigste Nebenwirkungen sind Übelkeit, Verstopfung und Schläfrigkeit; gefährlichste Nebenwirkung ist die lebensbedrohliche Atemdepression bei Überdosierung. Typische Darreichungsform ist die Tablette. Oxycodon hat seit Ende der 1990er Jahre im Rahmen der Opioidkrise in den Vereinigten Staaten Bekanntheit erlangt.
== Entwicklungsgeschichte == Oxycodon wurde 1916 von Martin Freund (1863–1920) und Edmund Speyer (1878–1942) an der Universität Frankfurt/Main entwickelt und ein Jahr später von Merck in Darmstadt unter dem Namen Eukodal als schmerz- und hustenstillendes Mittel auf den Markt gebracht. Seit 1919 wird es als Analgetikum therapeutisch genutzt. Die ersten Fälle von Oxycodon-Missbrauch, der in Analogie zum Morphinismus Eukodalismus genannt wird, wurden zu Beginn der 1920er Jahre geschildert. Im Zweiten Weltkrieg wurden dem Diktator Adolf Hitler von seinem Leibarzt Theo Morell angeblich regelmäßig Oxycodoninjektionen verabreicht. Die übliche Dosierung wurde in den 1960er Jahren mit 5 bis 10 mg als Hydrochlorid angegeben. Eukodal war bis 1990 in Deutschland im Handel und wurde wegen des sehr hohen Sucht- und Missbrauchspotenzials vom Markt genommen. In Deutschland und den Vereinigten Staaten wird Oxycodon unter den Markennamen Oxygesic (und generischen Namensformen) bzw. Oxycontin als verschreibungspflichtiges Medikament vertrieben. Zusätzlich unterliegt Oxycodon in Deutschland dem Betäubungsmittelgesetz. Oxycodon ist in verschiedenen Arzneiformen erhältlich. Es gibt u. a. Tabletten mit rascher Freisetzung, Retardtabletten (5–120 mg Wirkstoff enthaltend), Zäpfchen, Hartkapseln (mit 5–20 mg Wirkstoff) und sehr schnell wirksame Injektionslösungen (10 mg Wirkstoff pro Milliliter). Seit Herbst 2006 gibt es Oxycodon zusammen mit dem Opioidantagonisten Naloxon als Kombinationspräparat.
Diese agonistisch-antagonistisch wirkende Kombination, unter dem Handelsnamen Targin (als Retardtablette mit 5 bis 80 mg Oxycodon und 2,5 bis 40 mg Naloxon) wie Oxygesic von Mundipharma vertrieben, soll hauptsächlich der von Opioiden verursachten Verstopfung (Obstipation) entgegenwirken. Zudem kann der Naloxon-Anteil, wie auch bei der Kombination Tilidin/Naloxon, die missbräuchliche Verwendung speziell durch Drogenabhängige verhindern. Im Zusammenhang mit dem dramatisch angestiegenen Oxycodonmissbrauch in den USA entwickelte ein Unternehmen ein Retardpräparat, das missbrauchsresistent sein soll (Remoxy). Es handelt sich um eine Kapsel, die sich leicht herunterschlucken lässt. Der Wirkstoff, Oxycodon, befindet sich im Kapselinneren in einer klebrigen, zähflüssigen Masse, die sich weder injizieren noch schniefen lässt. Weder durch Einlegen in hochprozentigen Alkohol noch durch Zerkleinern nach Einfrieren (bis −80 °C) kann das Oxycodon freigesetzt werden. Die FDA versagte dem Medikament 2018 aufgrund eines ungünstigen Risiko-Nutzen-Verhältnisses die Zulassung für den US-amerikanischen Markt. Seit 2007 ist Oxycodon als Generikum erhältlich.
Sources: de.wikipedia.org
Reversed-phase HPLC gives the main purity figure, most often with UV detection near 214 nanometres. Mass spectrometry then confirms the molecular mass. Together the two methods distinguish a correct sequence from a closely related impurity.
The main chemical risks are methionine oxidation and backbone hydrolysis in solution. Moisture and repeated temperature cycling accelerate both processes. Dry powder held cold and desiccated is considerably more stable than any reconstituted preparation.
It holds a medicine registration in Russia, where it has been used clinically for decades. In most other countries it is treated as a research chemical. That split explains the uneven distribution of clinical literature.
It is described as a synthetic analogue of the ACTH(4–10) fragment, a short segment of adrenocorticotropic hormone. Its sequence differs from that fragment and includes two proline residues, which influence stability and behaviour in solution.