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Pupil constriction
Pupil constriction (also called pinpoint pupils or miosis) is the reduction of the size of a person's pupils under normal lighting conditions. Pupil constriction decreases a person's ability to see in low light conditions. This effect generally occurs on opioids.
Psychoactive substances
Compounds within our psychoactive substance index which may cause this effect include:
- Acetylfentanyl
- Amanita muscaria
- Buprenorphine
- Clonidine
- Codeine
- Desomorphine
- Dextropropoxyphene
- Dihydrocodeine
- Diphenhydramine
- Ethylmorphine
- Fentanyl
- Gaboxadol
- Heroin
- Hydrocodone
- Hydromorphone
- Kratom
- Methadone
- Morphine
- Nicotine
- O-Desmethyltramadol
- Oxycodone
- Oxymorphone
- Pethidine
- Tapentadol
- Tizanidine
- Tramadol
- U-47700