Potential complications and side effects of Botox injections include: Allergic reaction Discomfort or pain at the injection site Dry mouth Eyelid problems including drooping or swelling of the eyelids Facial asymmetry Fatigue Headache Infection Neck pain Pain, redness, swelling, bruising or bleeding at the injection site Vision and eye problems including dry eyes, double vision, blurred vision, and decreased eyesight The botulinum toxin that makes up Botox can spread to other areas in rare cases. This can cause a serious disease called botulism. Botulism can cause weakness of other muscles, including muscles that control swallowing and breathing. Spread of the botulinum toxin can be fatal in extreme cases. However, it has not occurred in properly selected patients who receive the recommended dose of Botox. Reducing your risk of complications The risk of serious complications with a Botox injection is greater in people with certain conditions. Tell your doctor if you have any of the following: Breathing problems or diseases including asthma or emphysema Difficulty swallowing History of bleeding problems or are taking blood thinner medications Pregnancy or nursing, or plan to become pregnant or nurse. It is not known if Botox injections are safe for unborn or nursing babies. Recent surgery or plan to have surgery in the near future Side effects from a botulinum toxin product in the past Weakness of facial muscles, such as trouble raising your eyebrows You can reduce the risk of some complications by: Consulting with your doctor before taking any prescriptions, over-the-counter medications, supplements, or herbal preparations. Certain medications can interact with Botox injections and cause serious side effects. Notifying your doctor immediately of any concerns, such as pain, eye or vision problems, weakness, bleeding, fever, and difficulty swallowing or breathing Telling all members of your care team if you have any allergies Telling all your healthcare providers, including your dentist, that you have had Botox injections