Pregnancy, breastfeeding and fertility while taking montelukast

You can take montelukast during pregnancy. It's important that your asthma is well controlled. Having difficulty with breathing during pregnancy can be dangerous for you and your baby.

Speak to your doctor if you become pregnant while you're taking montelukast. They may wish to review your medicine to check that you're on the best treatment for your asthma.

If your doctor, health visitor or midwife says your baby is healthy, you can take montelukast while you're breastfeeding.

It's important to continue taking montelukast to keep your symptoms under control. Breastfeeding will also benefit both you and your baby.

There is not much information about montelukast in breastfeeding, but the information shows that montelukast passes into breast milk in tiny amounts. It has not been known to cause any side effects in breastfed babies.

Talk to your health visitor, midwife, doctor or pharmacist as soon as possible if you have any concerns, including if your baby:

• is not feeding as well as usual
• seems unusually sleepy or irritable
• has diarrhoea

There's no evidence that montelukast affects fertility in either men or women.

Tell your doctor if you're:

• trying to get pregnant
• pregnant
• breastfeeding