Conversion of T4 to T3 is inhibited by all except.
Methimazole and carbimazole do not inhibit peripheral conversion of T4 to T3. Prophythiouracil, carbimazole, methimazole are thioamides used in hypehyroidism but only PTU inhibits t4 to t3 conversion among thioamides (REF.Essential of medical pharmacology K D TRIPATHI 6 Edition, Page No - 250)
Propanolol
Propylthiouracil
Amiodarone
Methimazole
Endocrinology