Lanthanum tablets (Fosrenol® )

What are lanthanum tablets and what do they do?

Lanthanum tablets (Fosrenol® ) belong to a group of medicines known as phosphate binders.

Normally your kidneys can control the level of most of the substances in the blood. However, when the kidneys are not working well phosphates can build up in the blood and can cause problems. When phosphate builds up in the blood it can combine with calcium in the blood and this mixture can cause damage by being deposited on the blood vessel walls. It can also cause itchiness and affect the strength of the bones and joints.

In order to control your phosphate levels you will be given advice on how to lower your phosphate intake by adjusting your diet, but phosphate binders are often prescribed in addition to this.

Lanthanum tablets prevent the absorption of phosphates into the bloodstream as they bind to the phosphate in your food. The combination is then passed out in your stools.

Why am I prescribed lanthanum tablets?

Lanthanum tablets have been prescribed for you to take as the phosphate level in your blood is high and lanthanum tablets may help to lower this in addition to a low phosphate diet.

How do I take my lanthanum tablets?

• These tablets are best taken towards the end of meals. They should be chewed and then swallowed.
• Phosphate binders only work if taken with foods containing phosphate.
• They should be taken with all meals.
• Your doctor, dietitian or specialist nurse will advise you on how many tablets to take with each meal.

Do I need to have any tests or be monitored because I am taking lanthanum tablets?

The levels of phosphate in your blood will be monitored regularly by either your GP or the hospital staff.

Are there any side effects?

The most common side effects to lanthanum tablets are constipation or diarrhoea and feeling sick.

These side effects should be mild but if you have any concerns about these or any other side effects please contact your doctor or specialist nurse for advice.

Are there any problems taking lanthanum tablets with any other medications?

Phosphate binders should not be taken at the same time as iron tablets, or some antibiotics, as this makes both ineffective. Take phosphate binders before a meal and iron tablets one hour after the meal. If you are prescribed any antibiotics take these doses at least two hours before or after your phosphate binder doses.

Only take tablets prescribed for you by your doctor and check with your pharmacist before taking any new medicines.

Further information

Further information about your tablet can be found in the patient information leaflet found in the tablet/capsule box or on the container.

If you have any other questions about your medication, please contact the medicines helpline on 01223 217502.