Correct answer: B • Erectile dysfunction and reduced libido
Why?
Stam X (commonly a sildenafil/tadalafil-type brand in South Asian markets) is a PDE-5 inhibitor used for:
Erectile dysfunction
Sometimes associated reduced sexual performance/libido complaints
It improves erection by:
↑ cGMP in penile smooth muscle
→ vasodilation
→ increased blood flow to corpus cavernosum
Why not others?
Migraine → triptans/analgesics
Tuberculosis → anti-TB drugs (isoniazid, rifampicin, etc.)
Peptic ulcer disease → PPIs, H2 blockers, antibiotics.