
The WHO's International Agency for Research on Cancer (IARC) has classified hydrochlorothiazide, voriconazole, and tacrolimus as Group 1 carcinogens.
These medicines are widely used for hypertension, fungal infections, and organ transplant rejection, with studies linking them to skin cancers and non-Hodgkin lymphoma.
Medical experts emphasize that patients should not stop these life-saving treatments without consulting a doctor, as the classification identifies hazard rather than immediate real-world risk.