NHS Rules state that up to 3 months prescriptions can be issued by a Doctors Surgery. Any additional medication beyond that for longer trips will need to be paid for privately as a private prescription or organised by registering with a doctor abroad. Please do see your doctor if you have a concern.
Medication for ‘in-case’ infections, malaria protection and any jabs will need to be collected as a private prescription under NHS rules. Your nurse organising your travel jabs will be happy to advise you.