## Sample Size Efficiency of 4-Period, 2-Seq, 2-Formulation Design [RSABE / ABEL]

❝ Can you post a link to the guidance?

Hi Helmut, many thanks for your response. Below are the PSG links, one PSG asks you to refer to the second, although the first one may have the information (Sorry, I don't know how to attach the document here). I look forward to your guidance. Regards

https://www.accessdata.fda.gov/drugsatfda_docs/psg/Levothyroxine_Sodium%20capsules_NDA%20021924_RC%20Oct%202018.pdf

https://www.accessdata.fda.gov/drugsatfda_docs/psg/Warfarin_Sodium_tab_09218_RC12-12.pdf