<prompt> Levothyroxine is used in:Thyroid stormCretinismEndemic goiterGraves disease  <response>: L-thyroxine is thyroxine analogue. It has a a more sustained and uniform action. It is used in cretinsm and in hypothyroidism it contains T4 T3 medication is liothyronine which is used very rarely -only in myxedema coma REF.Essential of medical pharmacology K D TRIPATHI 6 Edition, Page No - 248 