If you are using Uniphyl with consultation from your doctor, then you should keep the fact in mind that he has weighed the pros and cons of the medicine before prescribing them to you. There are a few side effects of using Uniphyl. You need to look out for the following and inform the doctor if they worsen: Nausea, Stomach pain, Headache, Trouble sleeping, Diarrhea, Irritability, Restlessness, Irregular heartbeat, Muscle cramps, Fainting, Confusion, Dizziness Get medical help right away if you have any very serious side effects. Developing an allergic reaction to Uniphyl is rare. However, if such a situation arises, get medical assistance immediately. If you notice anything other than above-listed side effects, you should contact your physician.