Since a tablespoon size varies based on design and manufacturer, it's not suitable for very accurate measurements as in medicine dosage. It is better to use ml for such medicine dosages. 1 tablespoon is taken to be 15 ml. However if an household tablespoon is used whose sizing is either too small like a 10 ml capacity or too big like 20 ml capacity, it will end up becoming either an underdose or an overdose. However, a tablespoon with ml markings is suitable