<prompt> Drug of choice for nodulocystic acne is:TetracyclinesAzithromycinIsotretioinCoicosteroids  <response>: Nodulocystic acne grade IV acne- DOC- Isotretinoin. Isotretinoin- 13 cis isomer of retinoic acid Dose :0.5-1mgkg kbwt Max cumulative dose: 120-150mgkgbwt 