Apothecaries measures - 4 fl.oz, to 1 fl.dr.:- 1 fluid drachm, 2 fluid drachm, 3 fluid drachm, 4 fluid drachm; 1/2 fluid ounce, 1 fluid ounce, 2 fluid ouce, 3 fluid ounce, 4 fluid ounce Apothecaries measures - 4 fl.oz