Immediate release fixed dose combination product [Regulatives / Guidelines]

Hello ping4santosh,

in addition to what ohlbe has said, I'd like to mention that the guideline does open up for "substitution"; read section 4.2.
Substitution on its own may not be adequate justification for the existence of your FDC (that's the issue with the section Ohlbe quoted), and that's why many companies in your situation will need to prove that the monos are co-prescribed in your target markets (unless they wish to spend trillions on clin. trials to prove some superiority over standard care).
Co-prescribing info, in turn, is "easily" obtained from third party sources but you will also be paying an arm and a leg for that info. You will not find the reports by googling. It may nevertheless be exactly what you need to justify the FDC.

Check also if "initial therapy" applies with your product - section 4.3. I can't determine that from the info you wrote.

This week's list of things I absolutely detest: Corona virus, the which function in R, WIA-WIA interfaces for scanning under Windows 10, the Bee Gees, the smell of my fridge.

Best regards,
ElMaestro