Mixing Diphenhydramine (Benadryl) and LSD (acid)
Caution
Beyond an ordinary 25–50 mg dose of diphenhydramine, LSD makes its delirium worse and adds heart strain. Keep diphenhydramine to that dose.
At 25-50mg, DPH may assist with side effects of the LSD such as nausea and anxiety. At higher dosages, the combination of a deliriant (DPH) and LSD is cautioned against. LSD is likely to increase the deliriant and negative effects of DPH, in addition to increasing the risk of severe injury and mental trauma. LSD and DPH at recreational dosages have additional cardiac concerns such as vasoconstriction, tachycardia, hypertension, which in combination may be exacerbated.
The risk here is to the experience — intensity, panic, thought loops, confusion. Physical harm is unlikely at ordinary doses. Setting, company and dose do most of the work.
Headspace vs physical riskCan you mix Diphenhydramine (Benadryl) and LSD (acid)?
MixSafe rates mixing Diphenhydramine and LSD as "Caution" — carries risk that is worth understanding before combining. Reduce doses and do not use alone. Source: TripSit drug combination chart, retrieved 2026-08-20. Educational information, not medical advice.
- Diphenhydramine also called
- benadryl, dph, sleep aid, zzzquil, unisom, doxylamine
- LSD also called
- acid, lsd-25, cid, lucy, tabs, blotter
TripSit drug combination chart, retrieved 2026-08-20. View the dataset.
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Rated caution. Educational information only, not medical advice. Absence of a documented interaction is not evidence of safety.