The stock dropped 14.72 per cent to Rs 332 on the BSE.
On the NSE, it tanked 15.64 per cent to Rs 328.
Baclofen GRS is a novel, once-a-day formulation developed by the company's proprietary gastroretentive system (GRS) technology, SPARC said in a filing to the BSE.
SPARC CEO Anil Raghavan had said: "We are disappointed with the outcomes of these studies and will evaluate the data in greater detail to decide on our next steps.