The chances of a severe reaction from immunotherapy are incredibly low. If you're experiencing a medical emergency, call 911 immediately and stop taking your drops. Before starting your treatment, you'll also have to option to receive a prescription for an epinephrine auto-injector in case of emergency use. Moderate symptoms can include hives, swelling or angioedema, vomiting, and coughing. For moderate reactions, pause your treatment and contact us by emailing firstname.lastname@example.org so we can help schedule an appointment with a provider.