Unfortunately there is no way to transfer these medical expenses forward to your 2018 tax return.
If you do not need to (or chose not to) use all your medical in a particular tax year, you must "remove the entries", and then reenter them the following year. If you already "claimed them" whether they resulted in a deduction or not, you'll need to file an adjustment because those amounts will appear on 2 different returns, and CRA will not allow it.
