The person that told you that clearly has zero understanding of what he is talking about. Their website even recommends it.
Dutasteride is stable for 90 days on Trichosol or more, I've been using it for 10 months with Trichosol with better results than any other carrier and it has never gotten lumpy.
Fragon's compatibility chart is here: https://es.fagron.com/sites/default...bla_compatibilidades_trichoconcept_2019_0.pdf
They list Dutasteride up to 0.25% as compatible which is what the Andorran Pharmacy has been selling for years. They also add Cremophor RH40 which avoids Dutasteride or Finasteride getting lump and makes it completely stable for 120 days.
>>>> It's directly Fagron who told me that.... Want proof ? They clearly told me they saw Dutasteride created lumps in a few days after and they don't recommande to use dutasteride in Trichosol anymore actually..... Why should they lie ?