As nouns the difference between ergotine and ergoline

is that ergotine is a powerful astringent alkaloid extracted from ergot as a brown, amorphous, bitter substance. It is used to produce contraction of the uterus while ergoline is a tetracyclic heterocycle whose structural skeleton is contained in a diverse range of alkaloids, including some psychedelic drugs, and whose derivatives are used clinically for vasoconstriction and in the treatment of migraine and Parkinson's disease.