Can someone explain the drug interaction between dutastride and ketoconazole please?

My dutastride pill has said I should not use it with ketoconazole so I stopped my keto shampoo and it has been really hard so far. I have extremely oily scalp. My scalp hurts from excess sebum 2 day after using clarifying shampoo.

I’ve searched on Google. Some papers say it increases dutastride potency, some are saying it’ll decrease it.

Idk what to do right now. Thanks.