Regulations controlling the sale of mild analgesics in Canada.

Some mild analgesic preparations are sold only on prescription; others are required to carry specific label warnings. The conditions of sale of some are further restricted by limitations on their dose. The "prescription only" sale of both phenacetin and acetaminophen would leave no "over-the-counter" analgesics available for individuals sensitive to salicylates. Since analgesic nephropathy results from long-term abuse of these preparations, the need is to prevent abuse without inhibiting their proper use.