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OTC Drugs: Special Groups at Risk of Adverse Effects

Who is most at risk of side effects from OTC products?

Over-the-counter (OTC) drugs are products you can buy without a doctor’s prescription. These medicines have a low risk of side effects when they are used occasionally by healthy adults. Some people may be more likely to have side effects or other problems from using OTC products. These groups include the following:

  • Children
  • Women who are trying to get pregnant, are pregnant or are breastfeeding
  • Older adults
  • People who have health problems
  • People who take prescription drugs

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What should I know about giving OTC products to children?

Tips on Giving the Right OTC Drug Dose to Your Child

  • Pay close attention to the dose information on the drug label. Make sure you give the right amount of medicine to your child at the right times.
  • Labels for liquid medicines show measurements in both teaspoons (tsp) and milliliters (mL). Keep in mind that 1 tsp is not the same as 1 mL (it is actually 5 mL).
  • A kitchen teaspoon may not hold the right amount of liquid medicine. Always use the measuring device that comes with the OTC medicine. Measuring devices include droppers, spoons made just for measuring liquid medicine, and cups that are labeled with both tsp and mL. Your pharmacist can also give you a proper measuring device. If you need help using the device, ask your pharmacist to show you how.
  • Measure carefully. If you’re giving liquid medicine that requires using a measuring cup, set the cup on a level surface. Then pour the medicine into it.
When used as directed, OTC products are not likely to cause problems for children. However, it’s important to remember that children process drugs differently than adults. For this reason, some OTC drugs come in special forms that are made just for children.

The following are things to keep in mind before you give your child any OTC medicine:

  • Acetaminophen (brand name: Children’s Tylenol Suspension Liquid and Soft Chews) is often a good choice for pain relief in children.
  • Children who are allergic to aspirin (one brand name: Bayer Children’s Chewable Tablets) are also likely to have problems using ibuprofen (some brand names: Children’s Advil Suspension or Chewable Tablets, Children’s Motrin Oral Suspension and Chewable Tablets).
  • Children who have asthma may have an allergic reaction to aspirin and ibuprofen. Talk to your doctor before giving one of these medicines to your child.
  • Don’t give aspirin to children under the age of 18 if they may have the flu (influenza) or chicken pox because they have a higher risk of Reye’s syndrome (a drug reaction that can lead to brain injury).
  • It’s very easy to give too much of an oral decongestant to a child. Before using one of these products, talk with your doctor. Decongestant nose drops should not be used for more than 3 days.
Be sure you follow the directions on the drug label to determine how much medicine to give your child and how often to give it to him or her. The box to the right lists some basic tips on giving your child the right dose of OTC drugs.

With prescription drugs, you usually need to keep giving them even when your child starts to feel better. However, unless your doctor tells you to keep giving an OTC product to your child, it’s OK to stop when he or she feels better.

If your child has a bad response after taking an OTC drug, tell your doctor right away. Keep a record of these events at home, including the name of the medicine, the amount given, what it was used to treat, and the side effects it caused.

You may find that tracking the medicine your child takes is helpful. One way to do this is by using a medicine log (PDF file: 1 page / 18 KB. More about PDFs.). Using a log can help avoid “double dosing” (giving too much medicine or giving the medicine too often). It can also provide helpful details to your family doctor if a problem occurs.

Talk with your family doctor if you have any questions about giving your child OTC medicines.

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What should women who are trying to get pregnant, are pregnant or are breastfeeding know about OTC drugs?

If you’re trying to get pregnant, are pregnant or are breastfeeding, check with your doctor before taking any drugs or herbal health products. Even drugs you can buy without a prescription can cause birth defects or affect a nursing baby.

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If you’re trying to get pregnant

The following are some things to think about if you’re trying to get pregnant:
  • Conception occurs about 2 weeks before your period is due. That means you may not even know you’re pregnant until you’re more than 3 weeks pregnant. Your baby is most sensitive to harm 2 to 8 weeks after conception. This is when your baby’s facial features and organs, such as the heart and kidneys, begin to form. Any medicine you take (or anything you eat, drink, smoke or are exposed to) can affect your baby. That’s why it’s best to start acting as if you’re pregnant before you are.
  • If you need to take medicine often because of a health problem, talk with your doctor about your treatment before you try to get pregnant. There may be other ways to treat your health problem during pregnancy besides taking medicine.

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Folic Acid Alert

Women who don’t get enough of the vitamin folic acid during pregnancy are more likely to have a baby with serious problems of the brain or spinal cord. These problems can occur very early in pregnancy—only 3 to 4 weeks after conception. So, be sure to get enough folic acid even when you’re just trying to get pregnant. Women need about 0.4 mg of folic acid a day. Sources of folic acid include green, leafy vegetables, oranges, bananas, milk, dry beans and peas, grains, and organ meats (such as chicken livers). Your doctor also may suggest that you take a vitamin that contains folic acid.

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If you are pregnant

The following are some basic guidelines for taking medicine when you’re pregnant:

  • Always talk to your doctor before taking any medicine or herbal health product when you’re pregnant.
  • If possible, avoid using medicines during your first trimester. This is when the risk to your baby is highest.
  • Acetaminophen (brand name: Tylenol) is usually safe for short-term pain relief during pregnancy.
  • Avoid using aspirin (two brand names: Bayer, St. Joseph) during pregnancy. It can cause low birth weight and problems during delivery.
  • Avoid using nonsteroidal anti-inflammatory drugs (NSAIDs), especially during the third trimester of pregnancy. NSAIDs can cause heart problems in your baby. NSAIDs include ibuprofen (two brand names: Advil, Motrin), ketoprofen (one brand name: Oruvail) and naproxen (one brand name: Aleve).

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If you are breastfeeding

The following are some basic guidelines for taking medicine when you’re breastfeeding:

  • Talk to your doctor before taking any medicine or herbal health product when you’re breastfeeding.
  • Acetaminophen and NSAIDs, such as ibuprofen, usually provide safe pain relief for women who are breastfeeding.
  • While breastfeeding, avoid using aspirin. Aspirin comes out in your breast milk. It can cause rashes and bleeding problems in nursing babies.
  • Limit long-term use of antihistamines. Antihistamines come out in your breast milk. They may cause side effects in nursing infants, such as drowsiness, crankiness, crying and sleep problems. Antihistamines may also decrease the amount of milk you produce. Antihistamines include brompheniramine (some brand names: Dimetapp Cold & Allergy Elixir, Robitussin Allergy & Cough Liquid), chlorpheniramine (one brand name: Singlet), dimenhydrinate (brand name: Dramamine), diphenhydramine (brand names: Benadryl Allergy, Nytol, Sominex) and doxylamine (two brand names: Vicks NyQuil, Alka-Seltzer Plus Night-Time Cold Medicine).
  • If you need to take an oral medicine, take it right after nursing or before your baby’s longest sleep period.
  • Watch your baby for signs of side effects. These signs can include a rash, trouble breathing, a headache or other symptoms that your baby didn’t have before you took the medicine.

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What should I know about OTC medicine use in older adults?

Often, older adults use many drugs at the same time, including prescription and OTC drugs. They also process drugs differently than younger adults. This is why older adults need to be especially careful about drug-drug interactions (problems that can happen when two or more drugs are taken at the same time).

If you are an older adult, talk with your doctor about all of the drugs and herbal health products you take. He or she can tell you whether you are at risk for having a bad reaction from taking an OTC drug. The following are a few of the problems that older adults may be at higher risk of having:

  • If you use an NSAID, you may be at risk of kidney disease and gastrointestinal (GI) bleeding.
  • The decongestant pseudoephedrine (two brand names: Contac Day and Night, Sudafed) can increase blood pressure in your eyes. This can lead to glaucoma. Pseudoephedrine also reacts badly with many other drugs, such as beta-blockers, indomethacin (brand name: Indocin), methyldopa (brand name: Aldomet), antidepressants, insulin and some products that treat low blood sugar.
  • If you take any drugs for a seizure problem, you should not use pseudoephedrine.
  • If you use a monoamine oxidase inhibitor (MAOI), avoid using pseudoephedrine or the cough medicine dextromethorphan (brand names: Delsym, Robitussin Maximum Strength, Vicks 44 Cough Relief). Pseudoephedrine and dextromethorphan can change the way MAOIs work in your system. MAOIs include isocarboxazid (brand name: Marplan), phenelzine (brand name: Nardil), selegiline (brand names: Eldepryl, Carbex) and tranylcypromine (brand name: Parnate). Note that pseudoephedrine and dextromethorphan may cause problems while you are taking an MAOI or within 2 weeks of taking one.
  • Antihistamines can cause drowsiness and blurred vision, which may increase your risk of falling. These medicines can also cause dry mouth and trouble urinating.

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What other groups should be careful about using OTC drugs?
People with health problems may be at higher risk of having problems when taking OTC drugs. Talk to your doctor before taking an OTC medicine if you have one of the following conditions or any other health problem:

If you take any prescription drugs you may be at greater risk of problems from taking OTC drugs. Before taking an OTC medicine, let your doctor know all of the other medicines you are taking.

See “OTC Drugs: Reducing Your Risk of Adverse Effects” for more information.

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Source

Written by familydoctor.org editorial staff.

American Academy of Family Physicians

Reviewed/Updated: 06/07
Created: 09/05