1 adjectives to describe effectual

Ale, except for a few constitutions, is too subtle and too sweet, generally causing acidity or heartburn, and stout alone is too potent to admit of a full draught, from its proneness to affect the head; and quantity, as well as moderate strength, is required to make the draught effectual; the equal mixture, therefore, of stout and porter yields all the properties desired or desirable as a medicinal agent for this purpose.

1 adjectives to describe  effectual