Certain ethnic groups including people of Asian South Asian descent are at greater risk. Symptoms of overdose may include: slowed breathing, loss of consciousness, muscle twitching, uncontrolled movements, very fast heartbeat. Tell your doctor immediately if any of these rare but very serious side effects occur: persistent nausea or vomiting, severe stomach abdominal pain, yellowing eyes and skin, dark urine, swollen glands, persistent mouth sores. Oral, and levonorgestrel subdermal implant contraceptives may render online recepta za tegretol the contraceptives less effective because the plasma concentrations of the hormones may be decreased. CYP 3A4 inducers can increase the rate of Tegretol metabolism. Genitourinary System: Urinary frequency, acute urinary retention, oliguria with elevated blood pressure, azotemia, renal failure, and impotence. The prescribing information for these drugs already includes warning that for all patients starting carbamazepine therapy, regardless of ethnicity, rare but severe and sometimes life-threatening skin reactions can occur.