Noscapine is a natural ingredient in opium, and is related to papaverine.
It doesn’t seem to have any opiate-like effects (other than cough
suppression) and is not constipating. It may be a NMDA/sigma ligand like
DXM. Adverse effects and effects of overdose include drowsiness, dizziness,
headache, nausea, allergic rhinitis, conjunctivitis, and skin rashes. I
have no idea whether it has recreational effects at high doses, but I
wouldn’t advise finding out. Oral adult dose is 25mg-50mg 3-4 times daily.
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