Police have found more than £150,000 worth of suspected cannabis resin and bush.
It comes following an overnight raid carried out by officers at an address in Douglas.
More than £30,000 in cash was also recovered.
A 31-year-old man was arrested and remains in police custody.
Plans for four-foot flood walls at Ramsey harbour
Garage blaze in the early hours of this morning
Art anarchists "hiding gold bars" in Douglas this week
No cases of terror financing through charities
You can now adopt an ambulance
Case for horse tram tracks 'under final review'
Council spends more than £1m on beads for cavities
Police recruitment drop-in sessions tonight