Himalaya Rapid Action Eucalyptus Cold Balm is a herbal product used to relieve nasal congestion and cold-related discomfort. It is applied externally in small amounts. In pregnancy, topical herbal balms are generally preferred over oral medicines, but eucalyptus based products should still be used with caution. It is best to use it only if advised by your doctor, who will assess your symptoms and ensure that the benefits outweigh any possible risks. Avoid excessive use and do not apply near the nose or chest unless specifically advised.