Drinking Beneficial Medicine
Scholars have said that if one dreams of drinking medicine and finding it beneficial, it may indicate their righteousness in religion. Drinking فقاع (barley drink) may suggest a benefit from a servant or service from a powerful man, and the dissipation of sorrows.
Per Ibn Sirin's Muntakhab al-Kalam fi Tafsir al-Ahlam
Note: These are traditional scholarly interpretations (ijtihad) drawn from a specific classical source — not a binding religious ruling, fortune-telling, or a prediction of the future.