Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
Medicine in a dream indicates righteousness in religion and knowledge. Drinking beneficial medicine indicates healing and guidance. Drinking unpleasant medicine indicates illness.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
Medicine indicates repentance and returning to God. Whoever sees himself drink medicine is learning useful knowledge.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
Medicine is interpreted as goodness and benefit. Whoever sees himself treating a sick person is advising an ignorant person.