REN and diabetes mellitus: In terms of the drug class (ATC second level), antineoplastic agents (L01), antivirals for systemic use (J05), antibacterials for systemic use (J01), psycholeptics (N05), immunosuppressants (L04), antidepressants (N06), cardiac therapy (C01), agents acting on the renin–angiotensin system (C09), drugs used in diabetes (A10), and analgesics (N02) were the top ten suspicious causative drug classes involved in most groups.