1. Look at (1) the small packaging box of medicines. The packaging boxes of genuine drugs are beautifully printed, with clear characters, even characters and letters except when necessary, and the numbers of production batch numbers are of the same size and even spacing. According to the regulations, the manufacturer, approval number and registered trademark must be indicated. Fake drugs are printed roughly, with characters and letters of different sizes, production batch numbers of different sizes, uneven spacing, or lack of one or all of the manufacturer, approval number and registered trademark, so the so-called "three noes" drugs are retired.

(2) See whether the tablets are uniform in size, whether the oral liquid is clear, whether the coating of sugar-coated tablets is uniform, and whether the capsule loading is consistent. For counterfeit drugs, the size of the same medicine bottle or the same batch of tablets is different, the oral liquid is turbid, or there are flocs or undue sediments, the thickness of the sugar-coated layer is different, the color difference is obvious, and the capsule content is much more, but less.

(3) Look at the color of sugar-coated tablets and capsule contents. For example, erythromycin and chloramphenicol are white, tetracycline is yellowish brown, and oxytetracycline is earthy white. If it does not meet the requirements, it may be counterfeit. The small packaging box of fake Contac capsules has rough printing, dark color, unclear batch number, different particle sizes and uneven colors in the capsules, different contents of the capsules, and unclear letters on the capsule shell.