[2019] to treat hypertension in women during the postnatal period, with appropriate monitoring of maternal renal function and maternal serum potassium. [2019] 1.9.5 For women of black African or Caribbean family origin with hypertension during the postnatal period, consider antihypertensive treatment with: or amlodipine if the woman has previously used this to successfully control her blood pressure. [2019] 1.9.6 For women with hypertension in the postnatal period, if blood pressure is not controlled with a single medicine, consider a combination of (or amlodipine) and enalapril[5] . If this combination is not tolerated or is ineffective, consider either: adding atenolol or labetalol to the combination treatment or swapping 1 of the medicines already being used for atenolol or labetalol. 1.9.7 When treating women with antihypertensive medication during the postnatal period, use medicines that are taken once daily when possible. 1.9.8 Where possible, avoid using diuretics or angiotensin receptor blockers[5] to treat hypertension in women in the postnatal period who are breastfeeding or expressing milk. [2010, amended 2019] 1.9.9 Treat women with hypertension in the postnatal period who are not breastfeeding and who are not planning to breastfeed in line with the NICE guideline on hypertension in adults. [2019] To find out why the committee made the 2019 recommendations on antihypertensive treatment during breastfeeding and how they might affect practice, see rationale and impact. 