CNS Overstimulation, restlessness, dizziness, insomnia, tremor, sweating, rarely, psychotic episodes at recommended depression following withdrawal of the drug. Contact your doctor immediately if you experience weakness, chest pain, difficulty breathing, fainting, shortness of breath, or swelling of the feet. If you notice other effects not listed above, contact your doctor or pharmacist. Most side-effects are mild and include feelings of restlessness, irritability, dry mouth, and anxiety, diarrhea, and changes in sex drive. Important safety information: Didrex may cause drowsiness or dizziness. First of all it needs prescription which for some people can be turn off and it is much more expensive route to take. Other more serious side-effects include difficulty breathing, swelling of slike didrex the tongue or lips, hives and an extreme increase in blood pressure.