Yes. Liquorice root in laxatives and cough medicines (as well as large amounts of eaten liquorice), ginseng and black cohosh can all increase your blood pressure, possibly making it harder to control. Always tell your doctor if you take any herbal remedies.

A number of other natural treatments, such as hawthorn, garlic, ginger, parsley and celery are said to lower blood pressure, but there is very little evidence to support their use. Ring the Medicines Line for more information on 1300 888 763.