After 2 weeks of botulinum toxin injection in the calf, you will feel a reduction in the strength of the calf, but it will not adversely affect your daily life and work. 3 to 4 weeks later, the effect of slimming the calf will be played, and the best effect of slimming the leg will be achieved in 6 to 8 weeks, which is the best time for additional injections to consolidate the effect, and the effect can last for 18 months. If only the first injection, the gastrocnemius muscle can also produce partial atrophy, but can not achieve the full effect, and the maintenance time is only 6 months. Complications of injection: 1. Postoperative side effects include pain and ecchymosis at the injection site, which can generally subside within a week after injection, and its incidence can be reduced if a finer needle is applied; 2. Muscle weakness and fatigue of the calf can occur, especially when wearing high heels, and can generally be gradually relieved after 2 to 3 weeks; 3. If the medial head of the gastrocnemius muscle is injected alone, it may lead to compensatory hypertrophy of the lateral muscle.