Production methods: from formaldehyde and ammonia condensation. The formaldehyde solution was placed in the reactor through ammonia, hexamine content condensation reaction in alkaline solution, the reaction temperature was maintained at 50-70 ℃, the material was cooled into the film vacuum evaporator methenamine spot at 60-80 ℃ to evaporate so that the concentration was increased from 24% to 38% -42%, and the reaction solution was filtered methenamine, by vacuum evaporation and crystallization, filtration drying derived products methenamine. No information 8,6 tolerance children under the age of the product, so caution. 1. The product can pass through the blood - the placental barrier methenamine use, although not yet found teratogenic, but pregnant women should still be used with caution in the goods. 2. The product can be secreted in breast milk, so breastfeeding women with caution when the goods suspend breast-feeding or taking the product. Elderly patients should adjust the dose of the product according to renal function. Maximum excess treatment day dose 4g. Large doses of the product (day 8g, continuous take 3 to 4 weeks), there may be irritative bladder symptoms (dysuria, urinary frequency), proteinuria and hematuria, and even liver may occur, kidney toxicity. Methenamine use, methenamine, three-level three-level chemical provided by the Jinan Chemical Co. Jinan three ping Chemical Co. (www.sanpinghuagong.com) strong, credible, in Jinan, Shandong chemical products industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead three levels of chemical into the brilliant and you work for a better future!