Quaque is a Latin word which means every or each. In medicine, it is abbreviated as q. For example, q_h, where q stands for quaque or every, and h stands for the number of hours. This prescription terminology means take the medicine every so- many hours.
It is also use together with letters like d, as in q.d. (qd or QD), where d stands for die (day). qd means take the medicine once a day.
Examples:
"1 tab q4h" means to take 1 tablet every 4 hours.
"2 caps q8h" means take 2 capsules every 8 hours.