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Harmful Effects of Medicines on the Adult Digestive System (from NIDDK)

Many medicines taken by mouth may affect the digestive system. These medicines include prescription (those ordered by a doctor and dispensed by a pharmacist) and nonprescription or over-the-counter (OTC) products. A glossary at the end of this fact sheet describes some common prescription and nonprescription medicines discussed below that may affect the digestive system.

Although these medicines usually are safe and effective, harmful effects may occur in some people. OTC's typically do not cause serious side effects when taken as directed on the product's label. It is important to read the label to find out the ingredients, side effects, warnings, and when to consult a doctor.

Always talk with your doctor before taking a medicine for the first time and before adding any new medicines to those you already are taking. Tell the doctor about all other medicines (prescription and OTC's) you are taking. Certain medicines taken together may interact and cause harmful side effects. In addition, tell the doctor about any allergies or sensitivities to foods and medicines and about any medical conditions you may have such as diabetes, kidney disease, or liver disease.

Be sure that you understand all directions for taking the medicine, including dose and schedule, possible interactions with food, alcohol, and other medicines, side effects, and warnings. If you are an older adult read all directions carefully and ask your doctor questions about the medicine. As you get older, you may be more susceptible to drug interactions that cause side effects.

People with a food intolerance such as gluten intolerance should make sure their medicines do not contain fillers or additives with gluten. Check with your doctor if you have any questions or concerns about your medicines. Follow the doctor's orders carefully, and immediately report any unusual symptoms or the warning signs described below.

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The Esophagus Irritation

Some people have difficulty swallowing medicines in tablet or capsule form. Tablets or capsules that stay in the esophagus may release chemicals that irritate the lining of the esophagus. The irritation may cause ulcers, bleeding, perforation (a hole or tear), and strictures (narrowing) of the esophagus. The risk of pill-induced injuries to the esophagus increases in persons with conditions involving the esophagus, such as strictures, scleroderma (hardening of the skin), achalasia (irregular muscle activity of the esophagus, which delays the passage of food), and stroke.

Some medicines can cause ulcers when they become lodged in the esophagus. These medicines include aspirin, several antibiotics such as tetracycline, quinidine, potassium chloride, vitamin C, and iron.

Warning signs
Pain when swallowing food or liquid. 
Feeling of a tablet or capsule "stuck" in the throat. 
Dull, aching pain in the chest or shoulder after taking medicines. 
Precautions
Swallow tablets or capsules while you are in an upright or sitting position. 
Before taking a tablet or capsule, swallow several sips of liquid to lubricate the throat, then swallow the tablet or capsule with at least a full glass (8 ounces) of liquid. 
Do not lie down immediately after taking medicines to ensure that the pills pass through the esophagus into the stomach. 
Tell your doctor if painful swallowing continues or if pills continue to stick in the throat. 

Esophageal Reflux

The lower esophageal sphincter (LES) muscle is between the esophagus and the stomach. The muscle allows the passage of food into the stomach after swallowing. Certain medicines interfere with the action of the sphincter muscle, which increases the likelihood of backup or reflux of the highly acidic contents of the stomach into the esophagus.

Medicines that can cause esophageal reflux include nitrates, theophylline, calcium channel blockers, anticholinergics, and birth control pills.

Warning signs
Heartburn or indigestion. 
Sensation of food coming back up into the throat. 
Precautions
Avoid foods and beverages that may worsen reflux, including coffee, alcohol, chocolate, and fried or fatty foods. 
Cut down on, or preferably quit, smoking. 
Do not lie down immediately after eating. 

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The Stomach Irritation

One of the most common drug-induced injuries is irritation of the lining of the stomach caused by nonsteroidal anti-inflammatory drugs (NSAIDs). 

NSAIDs can irritate the stomach by weakening the ability of the lining to resist acid made in the stomach. Sometimes this irritation may lead to inflammation of the stomach lining (gastritis), ulcers, bleeding, or perforation of the lining.

In addition, you should be aware that stomach irritation may occur without having any of the symptoms below. 

Older people are especially at risk for irritation from NSAIDs because they are more likely to regularly take pain medicines for arthritis and other chronic conditions. Also at risk are individuals with a history of peptic ulcers and related complications or gastritis. These individuals should tell their doctor about any of these previous conditions. Special medicines may be needed to protect the stomach lining.

Warning signs
Severe stomach cramps or pain or burning in the stomach or back. 
Black, tarry, or bloody stools. 
Bloody vomit. 
Severe heartburn or indigestion. 
Diarrhea. 
Precautions
Use coated tablets, which may lessen stomach irritation. 
Avoid drinking alcoholic beverages while taking medicines. 
Take medicines with a full glass of water or milk or with food, which may reduce irritation. 
Delayed Emptying of the Stomach
Some medicines cause nerve and muscle activity to slow down in the stomach. This slowing down causes the contents of the stomach to empty at a slower rate than normal. 

Drugs that may cause this delay include anticholinergics and drugs used to treat Parkinson's disease and depression.

Warning signs
Nausea. 
Bloating. 
Feeling of fullness. 
Vomiting of food eaten many hours earlier. 
Pain in midabdomen. 
Heartburn or indigestion. 
Sensation of food coming back up into the throat. 
Precautions
Eat frequent, small meals. 
Do not lie down for about 30 minutes after eating. 
Tell your doctor if symptoms continue. Your doctor may consider changing your dosage of the medicine or trying a new medicine. 

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The Intestine 

Constipation

Constipation can be caused by a variety of medicines. These medicines affect the nerve and muscle activity in the large intestine (colon). This results in the slow and difficult passage of stool. Medicines also may bind intestinal liquid and make the stool hard.

Medicines that commonly cause constipation include antihypertensives, anticholinergics, cholestyramine, iron, and antacids that contain mostly aluminium.

Warning sign
Constipation that is severe or disabling or that lasts several weeks. 
Precautions
Drink plenty of fluids. 
Eat a well-balanced diet that includes whole grains, fruits, and vegetables. 
Exercise regularly. 
Take laxatives only under a doctor's supervision. 
Diarrhea
Diarrhea is a common side effect of many medicines. Diarrhea is often caused by antibiotics, which affect the bacteria that live normally in the large intestine.

Antibiotic-induced changes in intestinal bacteria allow overgrowth of another bacteria, Clostridium difficile (C. difficile), which is the cause of a more serious antibiotic-induced diarrhea. 

The presence of C. difficile can cause colitis, an inflammation of the intestine in which the bowel "weeps" excess water and mucus, resulting in loose, watery stools. Almost any antibiotic may cause C. difficile-induced diarrhea, but the most common are ampicillin, clindamycin, and the cephalosporins. Antibiotic-induced colitis is treated with another antibiotic that acts on C. difficile.

Diarrhea also can be a side effect of drugs that do not cause colitis but that alter the movements or fluid content of the colon. Colchicine is a common cause of drug-induced diarrhea. Magnesium-containing antacids can have the effect of laxatives and cause diarrhea if overused. In addition, the abuse of laxatives may result in damage to the nerves and muscles of the colon and cause diarrhea.

Warning signs
Blood, mucus, or pus in the stool. 
Pain in the lower abdomen. 
Fever. 
Precautions
If diarrhea lasts for several days, consult your doctor. 

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The Liver 

The liver processes most medicines that enter the bloodstream and governs drug activity throughout the body. Once a drug enters the bloodstream, the liver converts the drug into chemicals the body can use and removes toxic chemicals that other organs cannot tolerate. During this process, these chemicals can attack and injure the liver.

Drug-induced liver injury can resemble the symptoms of any acute or chronic liver disease. The only way a doctor can diagnose drug-induced liver injury is by stopping use of the suspected drug and excluding other liver diseases through diagnostic tests. Rarely, long-term use of a medicine can cause chronic liver damage and scarring (cirrhosis).

Medicines that can cause severe liver injury include large doses of acetaminophen (and even in small doses when taken with alcohol), anticonvulsants such as phenytoin and valproic acid, the antihypertensive methyldopa, the tranquilizer chlorpromazine, antituberculins used to treat tuberculosis such as isoniazid and rifampin, and vitamins such as vitamin A and niacin.

Warning signs (for liver injury)
Severe fatigue. 
Abdominal pain and swelling. 
Jaundice (yellow eyes and skin, dark urine). 
Fever. 
Nausea or vomiting. 
Precautions
If you have ever had a liver disease or gallstones, you should discuss this with your doctor before taking any medicines that may affect the liver or the gallbladder. 
Take these medicines only in the prescribed or recommended doses. 

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Glossary of Medicines 

The following glossary is a guide to medicines used to treat many medical conditions. The glossary does not include all medicines that may affect the digestive system. If a medicine you are taking is not listed here, check with your doctor.

Acetaminophen
Acetaminophen relieves fever and pain by blocking pain centers in the central nervous system.

Examples of brand names include Tylenol, Panadol, and Datril.

Antacids
Antacids relieve heartburn, acid indigestion, sour stomach, and symptoms of peptic ulcer. They work by neutralizing stomach acid. 

Aluminum hydroxide antacids include Alu-Tab and Amphojel; calcium carbonate antacids include Tums, Alka Mints, and Rolaids Calcium Rich; magnesium antacids include Mylanta and Maalox.

Antibiotics
Antibiotics destroy or block the growth of bacteria that cause infection.

Hundreds of antibiotics are available, including penicillins (Amoxil, Amcil, and Augmentin), clindamycin, cephalosporins (Keflex and Ceclor), tetracyclines (Minocin, Sumycin, and Vibramycin), quinolones (Cipro), and sulfa drugs (Bactrim). 

Anticholinergics
This class of medicines affects the nerve cells or nerve fibers and includes drugs for depression, anxiety, and nervousness. 

Examples of anticholinergics include propantheline (Pro-banthine) and dicyclomine (Bentyl). Examples of antidepressants include amitriptyline (Elavil and Endep), and nortriptyline (Aventyl and Pamelor). 

Medicines for relieving the symptoms of Parkinson's disease also are in this category. Examples include levodopa (Dopar) and carbidopa and levodopa combination (Sinemet).

Anticonvulsants
These medicines control epilepsy and other types of seizure disorders. They act by lessening overactive nerve impulses in the brain. 

Examples of this class of medicines include phenytoin (Dilantin) and valproic acid (Dalpro).

Antihypertensives
Antihypertensives lower high blood pressure. They act by relaxing blood vessels, which makes blood flow more easily.

Examples of antihypertensives include methyldopa (Aldomet) and clonidine hydrochloride (Catapres).

Antituberculins 
These drugs for tuberculosis limit the growth of bacteria or prevent tuberculosis from developing in people who have a positive tuberculin skin test.

Brand names include INH, Dow-Isoniazid, Rifadin, and Rimactane.

Calcium channel blockers 
These medicines for angina (chest pain) and high blood pressure affect the movement of calcium into the cells of the heart and blood vessels, relax blood vessels, and increase the flow of blood and oxygen to the heart. 

Examples of calcium channel blockers include diltiazem (Cardizem), nifedipine (Procardia), and verpamil (Isoptin).

Chlorpromazine 
This tranquilizer relieves anxiety or agitation.

Examples of brand names include Thorazine and Ormazine.

Colchicine
This medicine eases the inflammation from gout and prevents attacks from recurring.

Iron 
Iron is a mineral the body needs to produce red blood cells. Iron supplements are used to treat iron deficiency or iron-deficiency anemia.

Laxatives 
Many forms of laxatives are available for relieving constipation. 

Common brand names of laxatives include Phillips' Milk of Magnesia, Citroma, Epsom salts, Correctol, and ExLax. 

Nitrates 
These drugs for angina (chest pain) relax blood vessels and increase the flow of blood to the heart. 

Examples of generic and brand names include isosorbide dinitrate (Iso-Bid and Isonate) and nitroglycerin (Nitro-Bid and Nitrocap).

Nonsteroidal anti-inflammatory drugs (NSAIDs) 
These drugs block the body's production of prostaglandins, substances that mediate pain and inflammation. NSAIDs relieve the pain from chronic and acute inflammatory conditions, including arthritis and other rheumatic conditions, and pain associated with injuries, bursitis, tendinitis, and dental problems. NSAIDs also relieve pain associated with noninflammatory conditions. 

Generic and brand names of NSAIDs include aspirin (Bayer and Bufferin), ibuprofen (Advil, Nuprin, and Motrin), tometin (Tolectin), naproxen (Naprosyn), and piroxicam (Feldene).

Potassium chloride 
Potassium is a vital element in the body. Potassium supplements help prevent and treat potassium deficiency in people taking diuretics.

Quinidine 
This medicine often is used to correct irregular heartbeat. 

Brand names of quinidine include Quinalan and Quiniglute.

Theophylline 
This medicine eases breathing difficulties associated with emphysema, bronchitis, and bronchial asthma. The medicine works by relaxing the muscles of the respiratory tract, which allows an easier flow of air into the lungs. 

Examples of brand names include Theo-Dur, Theophyl, and Bronkodyl.

Vitamins 
Vitamins serve as nutritional supplements in people with poor diets, in people recovering from surgery, or in people with special health problems. 

Niacin helps the body break down food for energy and is used to treat niacin deficiency and to lower levels of fats and cholesterol. 
Vitamin A is necessary for normal growth and for healthy eyes and skin. 
Vitamin C is necessary for healthy function of cells. 

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Notes and Insights:

Happy Birthday!
Happy Birthday Raven, KC and Cindy!! Check out all the birthdays at community/birthday/ and make sure to send them an arthritis-friendly e-card: cgi-bin/postcards/postcard.pl  

Wanna help?
Having surgery? Starting a new drug or treatment? Filing for disability? Keep an Arthritis Insight journal so all of our members can share and learn from your experience. If you want to keep a journal just let us know. 
Write an article! We always need articles on all subjects relating to arthritis. 
C'mon folks, we can't do this without you.

Weekly News Summary
Karen Sears

STRESS AND AGING AFFECTS IMMUNE SYSTEM
Stress is known to pack a punch to the immune system, and the whallop seems to hit the elderly the hardest, according to researchers at Ohio State University.
Reuters Health Jan 30
http://dailynews.yahoo.com/h/nm/20010130/hl/stress_1.html 

GENE MUTATION LINKED TO LUPUS IN MICE
Scientists have taken an important step in finding the genetic cause of lupus by identifying a genetic defect in mice that triggers a remarkably similar disease.
Reuters Health Jan 29
http://dailynews.yahoo.com/h/nm/20010129/hl/gene_1.html 

LAWMAKERS UNENTHUSIASTIC ABOUT BUSH DRUG PLAN
The first health bill President Bush sent to Congress--the ``immediate helping hand'' proposal for a block grant to states to help seniors with low-incomes or catastrophic drug costs pay for their medicine--is not receiving a warm welcome on Capitol Hill.
Reuters Health Jan 30
http://dailynews.yahoo.com/h/nm/20010130/hl/britain_1.html 

CANADIANS SAY HEALTHCARE SYSTEM IS ALIVE AND WELL
There is no true crisis in the Canadian healthcare system, according to doctors from the newly formed Tommy Douglas Research Institute.
Reuters Health Jan 29
http://dailynews.yahoo.com/h/nm/20010129/hl/canada_1.html 

2001 ARTHRITIS DRUG GUIDE GIVES MORE TREATMENT OPTIONS
With all of the arthritis drugs available, how does a consumer make the right choice? The Arthritis Foundation suggests using its 2001 Drug Guide--a one-stop source for all you need to know about medications used to treat arthritis and related conditions.''
Reuters Health Jan 29
http://dailynews.yahoo.com/h/nm/20010129/hl/arthritis_guide_1.html 

SUPPLEMENT SLOWS KNEE ARTHRITIS, RELIEVES PAIN
But Unregulated Glucosamine Products Vary in Quality, Experts Warn
WebMd Medical News Jan 25
http://onhealth.webmd.com/conditions/news/webmd/item,111803.asp 

'GENE PUTTY' HELPS BODY GROW NEW BONE
Substance Dramatically Improves Bone Healing
The procedure is still in the early stages of testing but has proven safe and effective in 19 patients with degenerative spondylolisthesis, a painful back and leg problem caused when a vertebra in the spine degenerates and slips over another vertebra.
WebMD Medical News Jan 29
http://onhealth.webmd.com/conditions/news/webmd/item,111817.asp 

IMMUNOMODULATION MAY BENEFIT PATIENTS WITH CHRONIC FATIGUE SYNDROME
Immunomodulation using lymph node extraction and ex vivo cell culture, followed by autologous cell reinfusion, significantly improves the symptoms of chronic fatigue syndrome, according to the results of a phase 1 trial.
Reuters Health Jan 29
http://rheumatology.medscape.com/
reuters/prof/2001/01/01.30/20010129clin005.html
(requires free registration) 

INFLAMMATORY ARTHRITIS UNRESPONSIVE TO MATERNAL-FETAL HLA INCOMPATIBILITY
Contrary to a previous report, maternal-fetal HLA incompatibility is not associated with remission of inflammatory polyarthritis in pregnancy, according to the results of a British study.
Reuters Health Jan 25
http://rheumatology.medscape.com/
reuters/prof/2001/01/01.26/20010125clin006.html
(requires free registration) 

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A Closing Thought

A few years ago, at the Seattle Special Olympics, nine contestants, all physically or mentally disabled, assembled at the starting line for the 100-yard dash.

At the gun, they all started out, not exactly in a dash, but with a relish to run the race to the finish and win. All, that is, except one little boy who stumbled on the asphalt, tumbled over a couple of times, and began to cry.

The other eight heard the boy cry. They slowed down and looked back. Then they all turned around and went back......every one of them.

One girl with Down's Syndrome bent down and kissed him and said, "This will make it better." Then all nine linked arms and walked together to the finish line. Everyone in the stadium stood, and the cheering went on for several minutes.

People who were there are still telling the story. Why? Because deep down we know this one thing: What matters in this life is more than winning for ourselves. What matters in this life is helping others win, even if it means slowing down and changing our course.

"A candle loses nothing by lighting another candle"...
~Author Unknown
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Arthritis Insight Newsletter Copyright 2001

Staff
Page last updated on January 31, 2001