Generic Lotronex

ALOSETRON is used to treat irritable bowel syndrome (IBS) in women. It is reserved for those women who have severe diarrhea as the main symptom and who have not had success with other treatments. This medicine has not been shown to work in men with IBS. Compare serotonin antagonists.

Alosetron Side Effects

What should I watch for?

Constipation is a common and serious side effect of this medicine. Stop taking this medicine and call your health care provider immediately if you become constipated. Only restart this medicine if your constipation has resolved and you and your doctor have agreed to restart treatment. You should not start taking this medicine if you are already constipated or constipated most of the time.

Ischemic colitis is a serious and potentially life-threatening condition that has been rarely reported with this medicine. If you experience new or worsening abdominal pain, bloody diarrhea or blood in the stool, immediately stop taking this medicine and contact your doctor or health care professional.

This medicine may not work for all women who take it. For women who are helped by this medicine, relief may occur within the first week or within four weeks of starting the drug. If you stop taking this medicine, it is likely that your symptoms will return within one week.

You may get drowsy or dizzy. Do not drive, use machinery, or do anything that needs mental alertness until you know how this medicine affects you. Alcohol can increase drowsiness or dizziness. Avoid alcoholic drinks.


Interactions with Medications

Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor immediately if any of the following side effects occur:

More common



Bloody diarrhea

new or worsening stomach pain or discomfort

rectal bleeding

Incidence not known

Abdominal or stomach pain, cramping, or burning

black, tarry stools






vomiting with or without blood or material that looks like coffee grounds

Get emergency help immediately if any of the following symptoms of overdose occur:

Symptoms of overdose

Clumsiness, unsteadiness, trembling, or other problems with muscle control or coordination

convulsions (seizures)

difficulty breathing

shakiness and unsteady walk

withdrawn or socially detached behavior

Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

Less common

Bleeding after bowel movement

full or bloated feeling

pressure in the stomach

swelling of abdominal or stomach area

uncomfortable swelling around rectal area

Incidence not known


skin rash

Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.

Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.

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