If you inject too much Botox into a patient, the result is called “Botox Toxicity.” This occurs when the level of botulinum toxin in the blood becomes too high. Symptoms of Botox toxicity can include: difficulty breathing, swallowing or speaking; blurred vision; drooping eyelids; hoarseness; and muscle weakness all over the body. In severe cases, Botox toxicity can lead to death. If you think someone has injected too much Botox, call 911 immediately and take them to the emergency room.