It could reduce its effectiveness or cause unwanted side effects. Drink alcohol, smoke, or use illegal drugs. These substances may affect how echinacea works. Echinacea is believed to work best when taken at the first sign of a cold.
While echinacea may not prevent a cold, this product may make cold symptoms less severe. DO NOT take echinacea on an empty stomach. Instead, take it with food or with a large glass of water. Apply creams or ointments to wounds that heal slowly as needed.
Follow the instructions on the package label or talk to your doctor before buying a product. Do not take it on an empty stomach. Echinacea should be taken with food or with a large glass of water. Do not take echinacea for longer than two weeks without consulting your doctor.