The symptoms of dizziness, nausea and weakness after the injection may be related to the side effects of the medication or sensitivity to the medication. The symptoms of dizziness, nausea and weakness after infusion may also be related to cerebrovascular diseases, cerebral arteriosclerosis and lack of oxygen to the brain due to insufficient blood supply to the brain. Brain hemorrhage, elevated intracranial pressure or elevated blood pressure may also cause dizziness and nausea. Blood pressure should be measured and head CT and MRI examinations should be done to determine the cause and take reasonable treatment measures as soon as possible. Dizziness and weakness after infusion may also be related to Meniere’s syndrome or anemia, blood sugar, cervical spondylosis, etc. You should increase the intake of nutritious food, and you can take drugs such as vertigo stop and tensin after vertigo is obvious.