If you are preparing a joint return, medical expenses can only be claimed by one person. You can always combine the medical receipts together if it is from the same provider/ pharmacy. If medical expenses are claimed by one person only, then it should under that persons' profile, you cannot combine them together, once you claim those expenses under your spouse's profile.
For more information please refer to this TurboTax link and a CRA Link.
Thanks for choosing TurboTax.