I pay a monthly fee to GMS, group medical services for medical, dental and prescription drug coverage. Can I claim this and if so where?

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Yes, you can claim the payment premiums of your health plan. 

To claim the payments of your health plan premium, include them with your other eligible medical expenses and claim the credit on line 330 of your return.

If you are paying premiums under a plan managed by your employer, you will find the exact amount paid on your T4 slip in the “other information” box. If you do not have the information on a T4 slip, keep your receipts to be able to prove the amounts you paid in the event of a CRA audit.