The stock slumped 7.45 per cent to Rs 1,236 on BSE.
On NSE, it declined 7.66 per cent to Rs 1,236.40.
The review of the drugs, which include anti-biotics cefuroxime and rulizole used to treat neurological disorder amyotrophic lateral sclerosis and sold both by Alkem and Slovenia's Krka, has been ordered after the German drug regulator raised concerns about trial study data.
Alkem conducted trials on the drugs at its Taloja facility in Maharashtra for Krka.
"We will be submitting suitable clarifications to EMA within the stipulated timeline to enable the Committee for Medicinal Products for Human Use (CHMP) to take a balanced risk-benefit view with respect to these two products," Alkem had said in a regulatory filing.
