- Anxiety suppression
- Cognitive euphoria
- Compulsive redosing
- Constipation
- Cough suppression
- Difficulty urinating
- Internal hallucinations
- Itchiness
- Nausea
- Pain relief
- Physical euphoria
- Pupil constriction
- Respiratory depression
- Sedation
opioid habit-forming common depressant
The prototypical opioid drug, a powerful analgesic with euphoric qualities, found in the seeds and wax of the plant papaver somniferum (opium poppy). First isolated by Friedrich Sertürner in 1805, named for its sleep-inducing qualities. Do not combine with other depressants, may cause dangerous respiratory depression in overdose.