What is the meaning of "or according to doctor's advice" under the usage and dosage in the drug instructions?

◆ Disease knowledge, medical knowledge, clinical knowledge and health science knowledge can help you recover from your illness and get a drug instruction. The words "or as directed by doctors" under the heading of usage and dosage have two meanings. ① The instructions indicate the routine dosage and usage. Generally speaking, patients can take it according to the conventional administration method. However, the sensitivity of each person's constitution and illness to drugs is different, and the dosage of drugs is also different. Doctors can increase or decrease the dosage of drugs according to the specific situation of patients. ② General drugs often have more than one purpose, and the dosage of each purpose is also different. For example, aspirin is a commonly used antipyretic. It is also an anti-rheumatic drug with antithrombotic effect. Used in three different diseases, the dosage varies greatly. Therefore, it is best to follow the doctor's advice when taking medicine, and don't take it yourself. Source: Information provided by Zhejiang Medical Association, all rights reserved, and may not be reproduced without permission.