The first Botox treatment is always a learning experience for both the patient and the clinician. After the first treatment the reactions from the muscles are established, and following treatments are administered more appropriately. What seems most likely to have happened is in trying to eliminate the lines from raising your brows, Botox was administered lateral to your pupillary line and your brow dropped. This will correct itself in 4 to 6 weeks. You must notify your clinician to make the appropriate changes to your next treatment.