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If you've ever been constipated, you may have tried over-the-counter laxatives. A number of factors — including a poor diet, physical inactivity and some medications — can disrupt normal bowel function and cause constipation.

Many safe, effective over-the-counter laxatives are available to treat occasional constipation in a variety of ways. However, it's very important to read the label directions carefully and to use them as directed. Overuse of laxatives may cause serious side effects.

Call your doctor immediately if you have:

• Bloody stools
• Severe cramps or pain
• Weakness or unusual tiredness
• Dizziness
• Rectal bleeding
• Unexplained changes in bowel patterns
• Constipation that lasts longer than seven days despite laxative use