Other Information: Do not store above 77 degrees F (25 degrees C). Store bottle in the outer carton. Product foams on contact with earwax due to release of oxygen. There may be an associated crackling sound. Keep tip on bottle when not in use. Misc: Carbamide peroxide 6.5% non USP (pH differs from USP specifications). No. 1 pharmacist recommended brand! Pharmacy Times - 2011 Master's Circle Award. Safe, gentle, non-irritating. Easily cleanses ear with microfoam action. When used as directed, Debrox cleanses the ear with microfoam action providing a safe, non-irritating method of softening and removing earwax. Note: Oversize package for ease in reading label information. Made in Canada.