Sinol Headache Relief Spray, Migraine Cluster Tension 15 ml (Pack of 2) will work best for headaches when symptoms first occur. It is a fast-acting, all-natural remedy that relaxes the muscles and blood vessels and can relieve headaches when they first begin. You should experience relief in 2–12 minutes. If your headache persists follow up immediately with a further 1–2 sprays. With severe headaches that feel deep in your head, you may need to tilt your head back and sniff deep to reach the headache area and use multiple sprays. Warnings: Do not use if you are allergic to any of the ingredients. Use of this container by more than 1 person may spread infection. Do not spray in or around the eyes. You may experience a mild burning sensation for 2-5 seconds. If pregnant or breastfeeding, ask a health professional before use. Keep out of reach of children. Store between 68 to 77 F (20 to 25 C).