Written By: Rosalin Dhal
Indian patent law prohibits grant of patent to new forms of known substance, unless the new form results in enhanced efficacy of
that known substance. The efficacy is therapeutic efficacy that can be
proved with the help of conducting clinical trials. Under the brand
Spiriva, BI (Boehringer Ingelheim) sells the crystalline salt form of tiotropium bromide monohydrate, which is effective for treatment of pulmonary diseases.
Two years ago, the outcome of the Novartis case
had determined the position of patenting new forms of known drugs in
India. Novartis appeal petition on patent application of the beta
crystalline form of imatinib mesylate, was rejected by the Supreme
Court. The court had then contended that section 3(d) of the patent act is a safeguard introduced by the parliament in 2005 to prevent Evergreening.
Evergreening is a practice adopted by pharmaceutical companies to
extend their monopolies over a drug by patenting new forms of existing
substance.
Cipla,
India’s fourth largest drug maker who opposed the patent Spiriva has
been marketing tiotropium bromide monohydrate under the brand Tiova since year 2003. Cipla must have breathe a sigh of relief on the revocation of BI’s Spiriva patent as it paved way for it to continue selling
its brand in the Indian market. The contention of BI that the
crystalline salt of tiotropium bromide monohydrate is more stable was
questioned by Cipla on the ground that it didn’t demonstrate any
significant change in the therapeutic efficacy to which the Patent
Office has agreed. Apart from Novartis, this January, even Abbot found
itself in a fix
when its drug Humira was revoked by the Patent Office after Glenmark
objected to the patent Grant before the Delhi High Court. To further
substantiate the observation made with respect to this trend, our
readers must be familiar with Cipla’s request for revocation of five patents owned by Novartis and the grant of compulsory license to Natco, ordered against Bayer Pharma.
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