Yes this is acceptable.
The legislation requires that the applicable dose or maximum dose is specified. The PGD may therefore specify a single dose or a range up to a specified maximum.
The pharmacist and doctor/dentist signing the PGD must be satisfied that the dose range is clinically appropriate and within the terms of the medicine’s marketing authorisation. The clinical criteria for selecting a dose within the range must be specified. The person supplying or administering under the PGD must be assessed as competent to make the dosage decision.