Britain's drug watchdog, the Medicines and Healthcare Products Regulatory Agency (MHRA) has ordered UK doctors to pay "careful consideration" to individuals' risk factors before prescribing them the combined hormonal contraceptives.
History of deep vein thrombosis or very high blood pressure are among the conditions that would prevent a doctor recommending the drugs.
This comes after a review by the European Medicines Agency which found that the packaging of the pills should be updated to ensure that women are made aware of the risks of blood clots.
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