Common side effects: affect 1 to 10 users in 100 • ZYPADHERA can sometimes enter the bloodstream too quickly and this may lead to the following side effects: excessive sleepiness, dizziness, confusion, disorientation, difficulty talking, difficulty walking, muscle stiffness or shaking, weakness, irritability, aggression, anxiety, increase in blood pressure, or convulsions and can lead to unconsciousness. • Sleepiness. • Injection site pain.