Dr. Amolkumar ☆ India, 2017-04-13 15:27 (2562 d 17:14 ago) Posting: # 17235 Views: 2,738 |
|
Dear sir, I am working on a project for development of Sustained release tablet (once or twice daily) against immediate release tablets (Conventional: 3 times a day, tau 8 h). I have calculate Loading dose (Css X Vd), Rate for maintenance dose (Css X CL), Dose to be maintain (Total daily dose of Immediate release tablets - Loading dose), No. of hours required for maintenance dose (Maintenance dose / Rate for maintenance) and Total no. of hours for complete drug release (Tmax + No. of hours required for maintenance dose). My questions are- 1. For the above calculation, I have consider the values of AUC last, Vd, CL, Tmax from the literature of drug of multiple oral doses. Am I right? 2. Is the obtained loading dose concentration (mg/h) for first hour or Tmax or anything else? 3. Should I have to multiply by Tmax to Loading dose for claiming that this Loading dose concentration is at Tmax ? or obtained Loading dose conc. itself is conc. at Tmax ? 4. Is that I am right or wrong for calculating Total no. of hours for complete drug release as mentioned above ? 5. By the above mentioned formula of Total no. of hours for complete drug release, the obtained answer is less than 24 hours. Then how should I claim that my SR tablet is sustainable for 24 hours ? 6. How can I calculate the no. of hours for maintenance dose till 24 hours considering the Rate for maintenance dose? and their release concentration required for every one/two hours till 100 % release at 24 hours ? 7. Can I plan for two sustained release tablets against three Immediate release tablets having same daily dose ? Your reply will be benchmark to me for thinking here onward on such projects. Thanks in advance. Regards, Dr. Amolkumar |