Who can and cannot take letrozole

Most adults aged 18 years old and over can take letrozole.

Letrozole is not suitable for some people. Tell your doctor before starting to take this medicine if you:

• have ever had an allergic reaction to letrozole or any other medicine
• still have periods
• are pregnant or breastfeeding
• are trying to get pregnant – unless you are taking it as a fertility treatment
• have serious kidney or liver disease
• have been told you have fragile or brittle bones (osteoporosis)