The special grace which we refer to as efficacious is sometimes called irresistible grace.
Those, however, which follow the last judgment, are simply and absolutely called efficacious volition and nolition, to which the effect succeeds.
'efficacious' - despite the fact that the chemist sells the medicines.
How many songs do you know that use the word "efficacious" without missing a beat?
Time is not by itself "efficacious"; that is, the mere passage of time does not augment or diminish the capacities of anything and, in particular, it does not enhance or decrease an agent's powers or abilities.