Legal analysis: It is completely legal to sell normal diet pills. The weight-loss drugs sold are fake medicines. Producers and business operators adulterate the products, pass off the fake products as genuine ones, and pass off unqualified products as qualified products. If the sales amount is between 50,000 yuan and 200,000 yuan, they shall be sentenced to fixed-term imprisonment of not more than two years or criminal detention. If the sales amount is between 200,000 yuan and 500,000 yuan, they shall be fined between two years and seven years. If the sales amount is between 500,000 yuan and two million yuan, they shall be sentenced to fixed-term imprisonment of not less than seven years.

Legal basis: Article 141 of the Criminal Law of People's Republic of China (PRC), whoever produces or sells counterfeit drugs shall be sentenced to fixed-term imprisonment of not more than three years or criminal detention and fined; Whoever causes serious harm to human health or has other serious circumstances shall be sentenced to fixed-term imprisonment of not less than three years but not more than ten years and fined; Whoever causes death or has other particularly serious circumstances shall be sentenced to fixed-term imprisonment of not less than 10 years, life imprisonment or death, and shall also be fined or confiscated.