Medicinal tea was a hot tea beverage with medicinal properties.
In 2370, Beverly Crusher recalled Felisa Howard for her remedies, including medicinal teas and advice, both often bitter tasting. (TNG: "Sub Rosa")
In 2375, Neelix offered his services as morale officer to a malfunctioning Seven of Nine, mentioning that he had "some wonderful medicinal teas". (VOY: "Infinite Regress")