GlaxoSmithKline said on Monday it had paid 64 billion rupees ($1.05 billion) to increase its stake in its Indian pharmaceuticals unit to 75 percent, as it banks on rising demand for medicines in emerging markets.

Britain's biggest drugmaker first announced plans to lift the holding in GlaxoSmithKline Pharmaceuticals from 50.7 percent in December. It held an open offer to buy the extra shares at 3,100 rupees each from Feb. 18 to March 5.

Final payment for shares tendered and accepted will be completed by March 20, GSK added.

David Redfern, GSK's chief strategy officer, said the decision to increase exposure to the Indian market was "a significant vote of confidence" in growth prospects for its business in India.

GSK, which has had a presence in India for 90 years, is keen to secure a bigger share of India's growing $14 billion-a-year market, which it views as promising despite recent moves to impose price cuts and limit patents on some medicines.

The open offer was managed by HSBC.