Oral Magnesium Pidolate, Hemoglobin SC Disease, MG Pidolate
Oral Magnesium Pidolate, Hemoglobin SC Disease, MG Pidolate
Subjects have a form of sickle cell disease, called hemoglobin SC disease. This results in
 abnormally shaped red blood cells that get 'stuck' in blood vessels and then results in
 episodes of severe pain (pain crises). Patients with the more common form of sickle cell
 disease, called hemoglobin SS disease, also suffer from pain crises. Treatment with the drug
 hydroxyurea is available to help prevent the pain crises in hemoglobin SS disease, but there
 is no good treatment to help prevent the pain crises in hemoglobin SC disease.

 It has been shown that one of the reasons for the formation of the abnormally shaped red
 blood cells in patients with SC disease is the fact that these cells do not contain enough
 water; they are dehydrated. Drinking more water will not increase the amount of water in the
 cells. Certain salts and minerals can however have an effect on the amount of water in the
 red blood cells. One of the most important minerals influencing this is called magnesium.
 Magnesium is present in food and also in certain medications used to treat heartburn.
 Magnesium has been used successfully both in animals and people to increase the amount of
 water in the red blood cells and is very well tolerated by most people.

 Investigators are using a new form of magnesium known as magnesium pidolate because this form
 of magnesium may help with the symptoms of disease without causing diarrhea (a common side
 effect of magnesium products).

 Purpose The purpose of this study is to find out whether treatment with magnesium pidolate
 will increase the amount of water in the red blood cell and result in fewer painful crises in
 patients with hemoglobin SC disease while not causing diarrhea.

 The study will last for about 64 weeks (about 16 months).
This is a placebo-controlled study which means that the effectiveness of the magnesium
 medication (the chemical form of which is known as Mg pidolate) will be compared to placebo.
 A placebo looks like the drug that is being studied (in this case magnesium) but does not
 contain any active drug of any kind. Comparing magnesium with placebo will help decide
 whether magnesium is better than treatment with placebo.

 The study lasts for 64 weeks (about 16 months) and is divided into 2 parts, each part lasting
 for 32 weeks (8 months). During the first part study medication (magnesium or placebo) will
 be taken twice daily for 24 weeks (about 6 months), followed by no study medication for 8
 weeks. These 8 weeks are called a washout period, during which time the effects of the study
 medication are 'washed-out' of the body. After the washout 8 weeks, patients will enter the
 second part of the study. During this second part, the study medication (magnesium or
 placebo) will again be taken twice daily for 24 weeks. During the second part of the study
 participants will receive whichever study medication that was not taken during the first part
 of the study. Following the second 24 weeks, there will be an observation period of 8 weeks
 (during which time no study medication is taken). The study is completed at the end of the
 8-week observation period. Participants will take magnesium for 24 weeks and placebo for 24
 weeks. The decision whether participants will receive magnesium or placebo first will be made
 randomly by a computer. This is a double-blind study which means that neither the participant
 nor the study doctor will know which study medication is taking during each part of the
 study. However, the study may be unblinded for safety issues if necessary.

 If the participant responds to the study medication, it can be continued after completion of
 the 24 weeks.

 The study medication is in the form of a liquid, taken two times a day (morning and evening)
 with the actual amount taken depending on the participant's weight.

 During this study the participant will be seen in clinic on a regular basis; initially every
 2 weeks, later once a month. There will be a total of 21 clinic visits during the study.
 Three of these are clinic visits that would normally take place in the routine management of
 this disease. The other 18 visits are required for this study. At each visit participants
 will have blood tests to measure the amount of magnesium in the blood, especially the red
 blood cells, but also to look for any other changes that might occur. The total amount of
 blood collected during the 16 month study is 120 ml (24 teaspoons), which is a safe amount.
 Three ml (half teaspoon) will be drawn at 13 visits, 5ml (1 teaspoon) at 4 visits, and 15ml
 (3 teaspoons) at a further 4 visits. At 4 of the clinic visits a urine test will be
 performed.

 During the study participants will be asked to keep a record of all episodes of pain, or any
 other changes that are noticed, in the form of a diary.
Inclusion criteria:

 This protocol is open to male and female patients of all races with a diagnosis of severe
 sickle hemoglobinopathy providing they also satisfy the following eligibility criteria:

 -  Adult and pediatric patients with Hb SC disease who are able to swallow the Mg
 pidolate preparation and who have had at least one prior painful crisis.

 Exclusion Criteria:

 -  Patients transfused within 90 days of study entry,

 -  Patients with elevated (>1.5 times upper limit of normal for age) BUN, creatinine, or
 liver function tests > 3 times the upper limit of normal for age,

 -  Patients who take a magnesium-containing medication (Mylanta, Maalox, etc.) on a
 regular (i.e., more than 2 days per week) basis.

 -  Patients with progressive neuromuscular disease or patients who are treated with a
 calcium channel blocker.

 -  Pregnancy