The S form of amlodipine is said to be responsible for dilation of blood vessels and lowering of blood pressure. The S- isomer of
amlodipine or Asomex® is being studied in clinical
trials and may lead to side effects such as fatigue or tiredness, dizziness or fainting, headache, flushing, or swelling of the legs or ankles. Side effects of amlodipine are generally mild and reversible.