The pure plant remedy for symptomatic relief of blocked sinuses, catarrh, hay fever, colds and flu. Olbas Inhaler contains essential oils that have decongestant properties.Before you use Olbas Inhaler.Do not use if you are allergic to any of the ingredients. Taking other medicines Please tell your doctor or pharmacist if you are taking or have recently taken any other medicines, including medicines obtained without a prescription. Pregnancy and breastfeeding It is best not to take any non-essential medication when pregnant or breastfeeding. Ask your doctor or pharmacist for advice before taking any medicine.