Doctors are welcoming an inquiry into the prescriptions from medicinal cannabis clinics.

The Medical Council's leading the investigation following patient complaints they weren't properly briefed on non-cannabis options at the clinics, or about the ongoing costs and side-effects of cannabis.

The Royal College of GPs Medical Director Luke Bradford says regulation of the clinics is overdue.

"Medicinal cannabis is lacking in evidence and should only be used once all other options have been trialled. And that's not happening in these clinics." 

LISTEN ABOVE