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Pharmaceutical firms such as Cipla, Matrix and AIDS patient group- Delhi Network of Positive People (DNP+), have filed post-grant opposition against Swiss multinational Roche's patent for its HIV drug valganciclovir at the Chennai Patent office., a drug used during organ transplantation and by HIV/ AIDS patients.   

According to a release, the Chennai patent office granted the patent to Roche last year without hearing the arguments of the two NGOs which had filed pre-grant opposition against the drug, a DNP+.

The NGO opposed the patent on the grounds that Valganciclovir is a ‘new form’ of an already known substance with no improvement in efficacy. DNP+ also alleged that many patents granted by the Chennai patent office were rejected in the US.