Like all medicines, this medicine can cause side effects, although not everybody gets them.
Very rarely, Norethisterone Tablets may cause a severe allergic reaction which can be life-threatening in some cases. You can get some or all of the following symptoms:
- wheezing
- difficulty breathing
- feeling faint
- swelling of the face or tongue
- swelling of the hands and feet
- intense itchy skin rash.
If you think you are reacting badly to the medicine, get emergency medical help immediately.
The following symptoms could be warning signs of thrombosis (a blood clot) which will need urgent treatment:
Symptoms of a blood clot in the lungs:
- Sudden, severe, sharp pain in your chest
- Coughing up blood
- You suddenly become short of breath
- Your heart beats more rapidly.
Symptoms of a blood clot in the brain (‘a stroke’):
- You have an unusually severe or long headache
- Your sight is affected in any way
- You find it difficult to speak
- You collapse or faint
- Any part of your body feels weak or numb.
Symptoms of a deep-vein thrombosis (DVT):
- You have severe pain, tenderness or swelling in your calf, ankle or foot
- You have purple discolouration of the skin of the leg or the skin becomes red and warm to touch.
If you get any of these symptoms, you should stop taking the tablets and see your doctor immediately.
You can also get the following side effects with medicines like Norethisterone Tablets:
Effects on the reproductive system and breasts: bleeding and spotting between periods, lack of periods (amenorrhoea), unexpected or unusual vaginal bleeding, changes in discharge from the cervix, cervical erosions (this may be seen when you have a smear test), cycles where you don’t ovulate (anovulation), breast pain and tenderness, a milky discharge from the breast when not pregnant or breastfeeding (galactorrhoea).
Effects on the nervous system: headache, depression, dizziness, fatigue, difficulty sleeping, confusion, nervousness, a feeling of intense happiness (euphoria), feeling sleepy, loss of concentration, vision problems.
Effects on the stomach and intestines: feeling or being sick, constipation, diarrhoea, dry mouth.
Effects on the liver: disturbed liver function, yellowing of the skin or whites of the eyes.
Cysts and tumours: a liver disorder, such as a benign liver tumour. These mostly do not cause any symptoms but can sometimes be felt. Benign liver tumours can sometimes cause severe abdominal pain.
Effects on your metabolism: altered fat levels in the blood, alteration of blood sugar levels, increased levels of insulin between meals and existing diabetes getting worse, decreased tolerance to some sugars like glucose, adrenergic-like effects (e.g. fine hand tremors, sweating, cramps in the calves at night), effects on the adrenal glands (e.g. Cushingoid syndrome), cloudy vision, sugar in your urine.
Effects on your heart and circulation: blood clots, including clots in the lung, and swelling in the veins due to blood clots, stroke, heart attacks, congestive heart failure, increased blood pressure, feeling your heartbeat, clots in the blood vessels of the retina (this causes visual problems), heart beating faster (tachycardia).
Effects on your skin and hair: acne, increase in body or facial hair, hair loss, itching, rash, hives.
Miscellaneous: fluid retention and swelling of hands and ankles, bloating, weight gain, raised temperature, change in appetite, changes in sex drive, fatigue, increase in calcium (seen in blood tests).