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Phillips' Cramp-free

Generic name: magnesium oxidemag-NEE-zee-um-OX-ide ]
Brand names: Phillips' Cramp-free, Uro-Mag, MagGel
Drug class: Minerals and electrolytes

Medically reviewed by on Apr 9, 2024. Written by Cerner Multum.

What is Phillips' Cramp-free?

Phillips' Cramp-free is used as a supplement to maintain adequate magnesium in the body.

Phillips' Cramp-free is also used to treat indigestion, upset stomach, or as a laxative to relieve occasional constipation.

Phillips' Cramp-free may also be used for purposes not listed in this medication guide.

Phillips' Cramp-free side effects

Get emergency medical help if you have signs of an allergic reaction: hives, difficult breathing, swelling of your face, lips, tongue, or throat.

Stop using Phillips' Cramp-free and call your doctor at once if you:

Common side effects of Phillips' Cramp-free may include:

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.


Follow all directions on the label and package. Use exactly as directed.

Before taking this medicine

You should not take Phillips' Cramp-free if you are allergic to it.

Ask a doctor or pharmacist if Phillips' Cramp-free is safe to use if you have or have ever had:

Ask a doctor before using this medicine if you are pregnant or breastfeeding.

Do not give this medicine to a child without medical advice.

How should I take Phillips' Cramp-free?

Use exactly as directed on the label, or as prescribed by your doctor.

Take this medicine with a full glass of water.

When using this medicine as a laxative, it may be best to take your dose at bedtime.

Phillips' Cramp-free may be taken with food if it upsets your stomach.

Stop using Phillips' Cramp-free and call your doctor if your symptoms do not improve after 7 days of treatment, or if they get worse.

Store at cool room temperature away from moisture and heat.

What happens if I miss a dose?

Phillips' Cramp-free is used when needed. If you are on a dosing schedule, take the missed dose as soon as you remember. Skip the missed dose if it is almost time for your next dose. Do not use two doses at one time.

What happens if I overdose?

Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.

Overdose symptoms may include nausea, vomiting, weakness, breathing problems, slow reflexes, extreme drowsiness, loss of consciousness, and feeling dizzy or light-headed.

What should I avoid while taking Phillips' Cramp-free?

Avoid taking other medications at the same time you use an antacid. Some antacids can make it harder for your body to absorb other medicines you take by mouth.

What other drugs will affect Phillips' Cramp-free?

Ask a doctor or pharmacist before using Phillips' Cramp-free with any other medicines, especially:

This list is not complete. Other drugs may affect Phillips' Cramp-free, including prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible drug interactions are listed here.

Further information

Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.