The treatment of Testosterone Undecanoate not working after taking it varies according to the reasons for its ineffectiveness. Common reasons include the drug itself, personal constitution, dosage and so on, and the specific disposition should follow the doctor’s advice. 1. The drug itself: when the quality of testosterone undecanoate has problems or has expired, it will affect its pharmacological effect, resulting in ineffective after taking. In this case, you can go to the regular medical institutions to purchase new drugs, standardized use and then observe the efficacy. 2. Individual constitution: If the user has low sensitivity to testosterone undecanoate or has developed drug resistance after long-term and large-scale use, or does not meet the indications of the drug (i.e. primary or secondary testosterone deficiency in men, female gender reassignment), it may lead to ineffectiveness after taking the drug. In this case, the treatment should be replaced by other drugs under the guidance of a doctor. 3. Dosage: Failure to standardize the use of medication according to the requirements of the drug instructions, such as low dosage, short duration of medication, etc., may lead to ineffective after taking. In this case, you should follow the doctor’s instructions to adjust the dosage or continue to use the drug for a period of time, and then observe its efficacy. It should also be noted that testosterone undecanoate is contraindicated in people who are allergic to it, pregnant women, men with suspected or confirmed prostate cancer or breast cancer, and nausea, myalgia and other adverse reactions may occur during the process of using the drug. In summary, when the situation of taking testosterone undecanoate is ineffective, you should seek medical advice to find out the reason, and then adjust the medication accordingly under the guidance of the doctor. Do not make blind judgment and dispose of it on your own, so as to avoid improper intervention and adverse consequences.