New Delhi: India's top drug regulatory body has found samples of around 50 medicines, including paracetamol, pantoprazole and some antibiotics widely used to treat bacterial infections, not of standard quality.

According to the alert issued by the Central Drugs Standard Control Organization (CDSCO) for the month of May, 22 of these sub-standard medicines are manufactured in Himachal Pradesh.

Apart from Himachal Pradesh, samples were collected from other places including Jaipur, Hyderabad, Waghodia and Vadodara in Gujarat, Andhra Pradesh and Indore.

According to the drug alert issued on June 20, a total of 52 samples have failed the quality test conducted by CDSCO.

State drug regulators have reportedly sent notices to the pharmaceutical companies concerned and the failed samples will be withdrawn from the market, sources said.

The list of sub-standard drugs includes clonazepam tablets which are used to treat seizures and anxiety disorders, painkiller diclofenac, anti-hypertension drug telmisartan, ambroxol, which is used in the treatment of respiratory diseases, fluconazole, An antifungal and some multivitamins and calcium tablets.

Samples of around 120 medicines manufactured in Himachal Pradesh had failed the testing parameters last year.