The use of trichlorfon should pay special attention to two points: First, it must not be used in conjunction with basic drugs, and second, it must not exceed the therapeutic dose. Trichlorfon belongs to organophosphorus preparations, and when combined with basic drugs, it can produce dichlorvos equivalent to 10 times its own toxicity, causing animal poisoning and even death. In the commonly used drugs, sodium bicarbonate, artificial salt, Jianwei San, various sodium salts of sulfonamides, soft soapy water, hard soapy water, lime water, etc. are all alkaline drugs. The therapeutic dose of trichlorfon is very close to the poisoning dose. A slight carelessness can poison the animal and even cause death. Therefore, in order to use trichlorfon safely and effectively, firstly, the body weight of the livestock must be accurately measured, and then the dosage should be precisely calculated according to its weight. In general, the use of cattle per kilogram of body weight is 20-40 milligrams, the highest dose is 15 grams; the use of sheep per kilogram of body weight is 80-100 milligrams, the highest dose is 5 grams; goats are more sensitive than sheep, per kilogram of body weight. The amount used is 50-70 mg, and the dose should not exceed 4 grams. In domestic animals, trichlorfon should be formulated as a 1-3% solution. The concentration of the trichlorfon is too low to deter insects. If the concentration is too high, side effects increase. In order to ease the stomach irritations of trichlorfon, it is best to use trichlorfon in combination with the appropriate amount of starch.
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