A staple Chinese pharmacy / supermarket format: a small glass vial with a foil cap, containing 10 ml of bitter-sweet syrup. The most iconic brands are
念慈菴枇杷膏 (Pei Pa Koa cough syrup),
太太口服液 (women's tonic), and
脑白金 (the late-night-TV-ad brain-supplement, basically melatonin). Often given as gifts to elderly relatives during holidays.