Dongvili is the trade name and generic name of Levocanidin Oral Solution, which is effective in treating weak spermatozoa. However, whether it works fast varies from person to person. In the male epididymis there is carnitine, can promote the maturation and vitality of sperm, the main component of levocarnitine is carnitine, is a mammalian energy metabolism in the body of the necessary natural substances, for the cell to provide energy, for men to improve the quality of sperm has a certain effect. However, since each person’s physical condition and the severity of the condition are different, whether the results are fast after using the drug varies from person to person. It should be noted that this product has certain side effects, long-term use of this product, can cause mild gastrointestinal discomfort (such as nausea, vomiting, abdominal cramps, etc.), after reducing the dosage, the above is not a gradual reduction or disappearance, for the product should be prohibited for those who are allergic to the product. In the use of levocanidin oral solution, it is recommended to use the drug under the guidance of a doctor, do not blindly self-medication, in order to avoid adverse effects.