Sun Pharmaceutical Industries on Thursday slumped as much as 6 percent, heading towards its biggest single day fall since March 16, 2012.
* Ranbaxy Laboratories also fell as much as 6 percent.
* Media reports say surprise inspection by US drug regulator on its Halol plant in Gujarat.
* A company spokesman said, "We have no comments to offer".
* "Majority of the inspections taking place nowadays are surprise inspection," Motilal said in a note to its clients.
* Must wait for the final audit report to come, the Motilal note adds.
* Also, Sun Pharma recalled 200 vials of a cancer drug in July.
* Separately, the US FDA said in May that Sun Pharma`s response to the import ban on its Karkhadi plant in Gujarat was inadequate.