Introduction: Botulinum toxin is used for decreasing spasticity, improving gait pattern and preventing secondary deformities and orthopedic surgeries in children with cerebral palsy. Despite its wide use, there is no evidence for the long-term beneficial effect of the toxin. Aim: The authors focused on the short-term effects of the toxin and on the subjective evaluation done by the parents about the botox treatment. Method: First, the calf muscle of 18 children was treated and casting was also performed. In our second patient group, multilevel lower limb injection was done in 12 cases. Joints' range of motion, muscle tone and spasticity were assessed before and 4-6 weeks after treatment. In ambulatory children, gait analysis was done. Side effects were recorded and parental opinion about the treatment was requested. Results: Increased ankle range of motion and decreased muscle tone and spasticity were seen in our first patient group. In the second group, hip flexion contracture became milder and hip abduction and the popliteal angle improved. However, gait analysis results only slightly changed after botox treatment. Occasional mild and transient adverse effects were observed during the pharmacologically active period of the toxin. Associate beneficial effects were also reported such as better comfort, easier movements, improving function of the non-injected upper limb, decreasing dysarthria and dysphagia. Conclusion: Our study strengthens the observation that botox treatment of the spastic calf muscle together with plaster casting can result in improved ankle dorsiflexion. Multilevel botox treatment can improve lower limb joints range of motion, however, gait pattern remains unchanged. The administration of botulinum toxin with respect to the guidelines has no major adverse effects. Further studies are needed to clarify the observed beneficial associate effects of the toxin. Orv Hetil. 2019; 160(28): 1105-1111.