There are three types of clenbuterol: clenbuterol hydrochloride, ractopamine hydrochloride, and ractopamine hydrochloride. Clenbuterol hydrochloride has the most toxic side effects. It is a β2-receptor, has an exciting effect on the heart, and has a strong and lasting dilation effect on bronchial smooth muscle. It is easier to absorb through the gastrointestinal tract after oral administration. After fat pigs are fed clenbuterol, toxic side effects such as limb tremors and weakness, myocardial hypertrophy, and heart failure gradually occur. People who eat pork containing clenbuterol hydrochloride often show symptoms: 1. Acute poisoning includes palpitations, muscle tremors in the face, neck, and limbs, hand tremors and even inability to stand, dizziness, and fatigue. Patients with existing arrhythmias are more likely to have reactions and heart arrhythmia. Tachycardia, premature ventricular contractions. 2. Patients with original sympathetic nervous system hyperfunction, such as those with hypertension, coronary heart disease, and hyperthyroidism, are more likely to have the above symptoms. 3. Combined use with glucocorticoids can cause hypokalemia, leading to arrhythmia. 4. Repeated use will cause tolerance, which will weaken the bronchodilation effect and shorten the duration. Ratopamine and ractopamine hydrochloride have less side effects and are allowed to be used appropriately in the United States, Japan and other countries. However, my country prohibits the use of any "clenbuterol" including ractopamine. So this information is useful to everyone, and I hope everyone can produce high-quality, healthy pork!