Dimenhydrinate is commonly sold as Dramamine or Gravol for motion sickness treatment. It dissociates into diphenhydramine (53-55.5% by weight) and 8-chlorotheophylline in the body, with roughly half the potency of pure diphenhydramine. At recreational doses, it causes severe delirium, realistic hallucinations, profound confusion, and anticholinergic toxicity.
Build-upvaries by mechanism; therapeutic tolerance may develop over weeks of regular use
Resettypically days to weeks after discontinuation
Tolerance Decay
Full tolerance
3dHalf tolerance
7dBaseline
~14d
Anecdotal reports suggest rapid tolerance to deliriant/anticholinergic cognitive and hallucinatory effects with repeated dosing over days, with partial reversal over 1–2 weeks. Data quality low; avoid frequent use to reduce cumulative anticholinergic burden.