Question

Caffeine is also a what opioid,narcotic,barbituarate,physcoactive

Answer 1

Caffeine is a psychoactive drug which is consumed widely by everyone across the globe. Anyhow, caffeine is a widely accepted psychactive drug which is accpted through the consumption of coffee and tea.

Answer 2

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Opioid receptors are a group of inhibitory G protein-coupled receptors with opioids as ligands. The endogenous opioids are dynorphins, enkephalins, endorphins, endomorphins and nociceptin. The opioid receptors are ~40% identical to somatostatin receptors.