Is the usage of "combine" correct here?

[NewHopeR]

The drugs for the therapy were drug A combined with drug B or drug C alone.

The sentence above refers to "The drugs for the therapy were (drug A + drug B) or drug C alone.

If the usage is incorrect, how to edit it?

[Rover_KE]

'The medication for the therapy was drug C or a combination of drug A and drug B.'

[NewHopeR]

'The medication for the therapy was drug C or a combination of drug A and drug B.'

Thank you.

I wonder whether "drug A combined with drug B" is grammactically acceptable (though awkward).

[NewHopeR]

'The medication for the therapy was drug C or a combination of drug A and drug B.'

Thank you.

I wonder whether "drug A combined with drug B" is grammatically acceptable (awkward though).

[bhaisahab]

Thank you.

I wonder whether "drug A combined with drug B" is grammatically acceptable (awkward though).

It's grammatically fine and not particularly awkward.