Most oral syringes can be reused, although it depends on the type. Always check the manufacturers instructions and consult a medical professional if you have concerns. It also depends on what the oral syringe is used for. For example, it is recommended to dispose of, rather than reuse, oral syringes that have been used for oral chemotherapy medications.
To reuse an oral syringe, it is necessary to wash all parts of the syringe thoroughly with warm soapy water. You can also sterilise the syringe with very hot water if needed, but avoid cleaning products that can remove the dosage markings or leave residue behind.