It is very important that your doctor check your progress at regular visits to make sure that this medicine is working properly. Blood tests may be needed to check for unwanted effects.

This medicine may cause hypomagnesemia (low magnesium levels in the blood). Check with your doctor right away if you have drowsiness, loss of appetite, mood or mental changes, muscle spasms (tetany) or twitching, seizures, nausea or vomiting, trembling, or unusual tiredness or weakness.