German physician Michael Weiser, MD tested Euphorbium Nasal Spray against a placebo on 172 patients. Each patient received 2 discharges of spray into each nostril 4 times a day for 5 months. Patients with chronic sinusitis experienced considerable improvement in terms of reduced headaches, sinus pressure, and breathing difficulties.
Another study conducted by German doctors with 3,510 patients with chronic sinusitis found that 75% rated the nasal spray as "excellent" to "good." Euphorbium Nasal Spray is available in the U.S.