What special precautions should I follow?  

Before taking ascorbic acid,

• tell your doctor and pharmacist if you are allergic to ascorbic acid or any other drugs.
• tell your doctor and pharmacist what prescription and nonprescription medications you are taking, including other vitamins.
• tell your doctor if you have or have ever had kidney stones. Diabetics should talk to their doctor or pharmacist for the correct way to test their urine while taking large amounts of ascorbic acid.
• tell your doctor if you are pregnant, plan to become pregnant, or are breast-feeding. If you become pregnant while taking ascorbic acid, call your doctor.

What special dietary instructions should I follow?  

Some forms of ascorbic acid contain sodium and should be avoided if you are on a sodium- or salt-restricted diet.

Your doctor may suggest changes in your diet to give you more vitamin C.

What should I do if I forget a dose?  

Take the missed dose as soon as you remember it. However, if it is almost time for the next dose, skip the missed dose and continue your regular dosing schedule. Do not take a double dose to make up for a missed one.