US President Donald Trump’s threat of imposing tariffs as high as 250per cent on pharmaceutical imports is putting cheap supplies from Indian drugmakers at risk, with commonly prescribed oral contraceptives at the top of the list.

Approximately 65per cent of all birth control pill prescriptions in the US last year were manufactured by just two India-based companies, Glenmark Pharmaceuticals Ltd. and Lupin Ltd. , according to a Bloomberg News analysis of data provided by health care intelligence firm Symphony Health.

While dependence on Indian imports and a narrow supply base is particularly acute for the birth control pills , some other drug categories are not far behind. Treatments for hypertension and depression are second only to birth control medication, with more than 50pe

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