Like all medicines, Circadin can cause side effects, although not everybody gets them. The following events are considered to be uncommon (i.e. likely to occur in fewer than 1 in 100 patients):
Irritability, nervousness, restlessness, insomnia, abnormal dreams, anxiety, migraine, lethargy, restlessness associated with increased activity, dizziness, tiredness, high blood pressure, upper abdominal pain, indigestion, mouth ulceration, dry mouth, changes in the composition of your blood which could cause yellowing of the skin or eyes, inflammation of the skin , night sweats, itching, rash, dry skin, pain in extremities, menopausal symptoms, feeling of weakness, chest pain, excretion of glucose in the urine, excess proteins in the urine, abnormal liver function and weight increase.
The following events are considered to be rare (i.e., likely to occur in fewer than 1 in 1,000 patients):
Shingles, reduced number of white blood cells in the blood, decreased number of platelets in the blood, high level of fatty molecules in the blood, severe chest pain due to angina, feeling your heartbeat , low serum calcium levels in the blood, low sodium levels in the blood, altered mood, aggression, agitation, crying, stress symptoms, disorientation, early morning awakening, increased sex drive, depressed mood, depression, loss of consciousness or fainting, memory impairment, disturbance in attention, dreamy state, restless legs syndrome, poor quality sleep, ?pins and needles? feeling, visual impairment, blurred vision, watery eyes, dizziness when standing or sitting, vertigo, hot flushes, acid reflux, stomach disorder, blistering in the mouth, tongue ulceration, stomach upset, vomiting, abnormal bowel sounds, wind, excess saliva production, bad breath, abdominal discomfort, gastric disorder, inflammation of the stomach lining, eczema, skin rash, hand dermatitis, psoriasis, itchy rash, nail disorder, arthritis, muscle spasms, neck pain, night cramps, prolonged erection that might be painful, inflammation of the prostate gland, tiredness, pain, thirst, passing large volumes of urine, presence of red blood cells in the urine, urinating during the night, increased liver enzymes, abnormal blood electrolytes and abnormal laboratory tests.
If any of the side effects gets serious, or if you notice any side effects not listed in this leaflet, please tell your doctor or pharmacist.