Follow the directions printed on the product label or given by your doctor. Echinacea may cause nausea, vomiting, or allergic reactions. If you are allergic to ragweed, chrysanthemums, marigolds, or daisies, you are more likely to have an allergic reaction to echinacea. If you are pregnant or breast-feeding, you should get the approval of your doctor before taking echinacea. People with multiple sclerosis, leukosis, collagenosis, AIDS, or tuberculosis should NOT use echinacea.
Some natural remedies have the same effects as prescription medicines.
This means there is a danger of being overmedicated. If you have any unusual effects while taking any natural remedy, get advice from a doctor right away. Do not use echinacea for more than 8 weeks in a row because it may depress your immune system. After you stop, do not take echinacea for at least 8 weeks. After 8 weeks you can take it again for another 8-week period.