Regulation 46 of the Principal Regulations is amended as follows:(a) by omitting from subregulation (2A) "3 months" and substituting "4 months" ;(b) by omitting paragraph (b) from subregulation (12) and substituting the following paragraph:(b) the person must retain the prescription, in a form that is retrievable within 48 hours, for a period of 2 years from the day on which the requirement to cancel the prescription arose.