Cranial diabetes insipidus
Mild cranial diabetes insipidus may not require any medical treatment.
Cranial diabetes insipidus is considered mild if you produce approximately 3 to 4 litres of urine over 24 hours.
If this is the case, you may be able to ease your symptoms by increasing the amount of water you drink to avoid dehydration.
Your GP or endocrinologist (a specialist in hormone conditions) may advise you to drink a certain amount of water every day, usually at least 2.5 litres.
But if you have more severe cranial diabetes insipidus, drinking water may not be enough to control your symptoms.
As your condition is caused by a shortage of vasopressin (AVP), your GP or endocrinologist may prescribe a treatment that takes the place of AVP, known as desmopressin.
Desmopressin is a manufactured version of AVP that's more powerful and more resistant to being broken down than the AVP naturally produced by your body.
It works just like natural AVP, stopping your kidneys producing urine when the level of water in your body is low.
Desmopressin can be taken as a nasal spray, in tablet form or as a form that melts in your mouth, between your gum and your lip.
If you're prescribed desmopressin as a nasal spray, you'll need to spray it inside your nose once or twice a day, where it's quickly absorbed into your bloodstream.
If you're prescribed desmopressin tablets, you may need to take them more than twice a day.
This is because desmopressin is absorbed into your blood less effectively through your stomach than through your nasal passages, so you need to take more to have the same effect.
Your GP or endocrinologist may suggest switching your treatment to tablets if you develop a cold that prevents you using the nasal spray.
Desmopressin is very safe to use and has few side effects.
But possible side effects can include:
If you take too much desmopressin or drink too much fluid while taking it, it can cause your body to retain too much water.
This can result in:
- feeling bloated
- hyponatraemia – a low level of sodium (salt) in your blood
Symptoms of hyponatraemia include:
- a severe or prolonged headache
- nausea and vomiting
If you think you may have hyponatraemia, stop taking desmopressin immediately and call your GP for advice.
If this is not possible, go to your local A&E department.
Nephrogenic diabetes insipidus
If you have nephrogenic diabetes insipidus that's caused by taking a particular medication, such as lithium or tetracycline, your GP or endocrinologist may stop your treatment and suggest an alternative medication.
But do not stop taking it unless you have been advised to by a healthcare professional.
As nephrogenic diabetes insipidus is caused by your kidneys not responding to AVP, rather than a shortage of AVP, it usually cannot be treated with desmopressin.
But it's still important to drink plenty of water to avoid dehydration.
If your condition is mild, your GP or endocrinologist may suggest reducing the amount of salt and protein in your diet, which will help your kidneys produce less urine.
This may mean eating less salt and protein-rich food, such as processed foods, meat, eggs and nuts.
Do not alter your diet without first seeking medical advice.
Your GP or endocrinologist will be able to advise you about which foods to cut down on.
If you have more severe nephrogenic diabetes insipidus, you may be prescribed a combination of thiazide diuretics and a non-steroidal anti-inflammatory drug (NSAID) to help reduce the amount of urine your kidneys produce.
Thiazide diuretics can reduce the rate the kidney filters blood, which reduces the amount of urine passed from the body over time.
Side effects are uncommon, but include:
This last side effect is usually temporary and should resolve itself if you stop taking the medication.
Non-steroidal anti-inflammatory drugs (NSAIDs)
But long-term use of NSAIDs increases your risk of developing a stomach ulcer.
To counter this increased risk, an additional medication called a proton pump inhibitor (PPI) may be prescribed.
PPIs help protect your stomach lining against the harmful effects of NSAIDs, reducing the risk of ulcers forming.
Help with health costs
If you have diabetes insipidus, you do not have to pay prescription charges for desmopressin.
You'll need to fill in a medical exemption (MedEx) certificate to qualify.
See Help with health costs for more information about how to apply for a MedEx certificate.
You may have to pay for other drugs that may be required on a short-term basis, such as thiazide diuretics.