Adipex should only be used with doctor’s prescription, which indicates that its benefit is greater than the risk factors for you. Many people using Adipex do not encounter any serious side effects. However, it is recommended to immediately seek medical help if any of these side effects persist for long time. Besides the common side effects, there are some serious side effects also associated with the use of Adipex. This medication may increase your blood pressure and may trigger side effects like, irregular/fat heartbeat, mood changes, uncontrolled anger, hallucinations, nervousness, uncontrolled muscle movements, seizures, severe headache, blurred vision or change in interests. In any such circumstance, you should stop taking medicine and get medical help right away and talk to your doctor.