Flow restrictors for use with a syringe or without a syringe are disclosed for dispensing a liquid medicine for an infant or child. The flow restrictors include a cover having a raised ring, a sleeve for insertion into a bottle, a self-sealing orifice for dispensing the medicine and including an annular cylinder having vertical supports or ribs which extend outward and engage the inside wall of the sleeve. The sleeve includes one or more external protrusions.