The Department of Health and Social Care says it doesn't know how many people on the Island are prescribed medical cannabis.
It was responding to a Freedom of Information request about the number of registered medicinal cannabis users.
But in its response, it said Manx Care doesn't prescribe cannabis products - which are only available through private prescriptions.
The private prescribing clinics are registered and inspected by the government, but the number of prescriptions isn't recorded by Manx Care.
easyJet launches first international flights from the Isle of Man
Sea Terminal arrests up by nearly half
Part of prom to close for supercar tour today
Southern road to shut for seven weeks
Today likely to be hottest of year
More to be done on violence against women, says minister
Second election candidate withdraws in southern constituency
Cold water still a danger for swimmers despite the heat