Supplement side effects
It's very unusual to get side effects from vitamin D, calcium or phosphate supplements if they're given in the correct dose. Your doctor will advise you about how much supplement is needed, for how long, and the monitoring of treatment.
If the vitamin D or calcium dose is too high or the treatment is continued for too long or isn't carefully monitored, it can raise calcium levels in the blood. This can result in a condition called hypercalcaemia.
Symptoms of hypercalcaemia include:
- passing a lot of urine
- feeling thirsty
- reduced appetite
- nausea, abdominal pain, constipation and vomiting
- dizziness and headaches
- bone pain
See your GP immediately if you or your child have any of these symptoms.
If you have osteomalacia – the adult form of rickets that causes soft bones – treatment with supplements will usually cure the condition.
However, it may be several months before any bone pain and muscle weakness is relieved.
You should continue taking vitamin D supplements regularly to prevent the condition returning.