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NBOMes

Group: Psychedelics
Nicknames: N-bomb, 25I, 2C-I-NBOMe, Cimbi-5, 25-NB, 25x-NBx
Last reviewed: October 2026

Pharmacology

NBOMes share some chemical structural similarity to 2C drugs (but are far more active; see Harm Reduction) and is a very potent 5HT2A receptor agonist with active doses under 1 mg and effects lasting between 3 and 12 hours. Its effects have been compared to 2C-I, LSD, and DOI (2,5-dimethoxy-4-iodoamphetamine).

25I- and 25B-NBOMes are full agonists for the human 5HT2A receptors, whereas 25C-NBOMe is a partial 5HT2AR agonist more aligned to other more well-known psychedelics. Additionally, many NBOMes have high affinity for the 5HT2B and adrenergic α1 receptors, which are suspected to play a role in their association with cardiac toxicity.

In contrast to the 2C drugs, 25I-NBOMe is only metabolised by the CYP450 enzymes, not MAO-A and -B. However, it is still recommended to avoid taking MAO inhibitors such as phenelzine, tranylcypromine, moclobemide, and selegiline alongside psychedelics like NBOMes.

Little is known about the long-term effects or risks associated with regular consumption of NBOMes. The lethal dose is not known, so it is recommended to take extreme caution if taking them. NBOMes should only be taken in microgram (µg) doses, not milligrams (mg). This size of dose is very small, so snorting is not recommended due to the high risk of overdose.

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