Information about Giardiasis


Giardia is a microscopic parasite that causes the diarrheal illness known as giardiasis.1

The most common symptoms of giardiasis can include: diarrhea, gas, greasy stools that tend to float, stomach or abdominal cramps, upset stomach or nausea/vomiting, and/or dehydration (loss of fluids). In some cases, people infected with Giardia have no symptoms.1

Giardia can be spread1:

  • Swallowing Giardia picked up from surfaces (such as bathroom handles, changing tables, diaper pails, or toys) that contain stool from an infected person or animal
  • Drinking water or using ice made from water sources where Giardia may live (for example, untreated or improperly treated water from lakes, streams, or wells)
  • Swallowing water while swimming or playing in water where Giardia may live, especially in lakes, rivers, springs, ponds, and streams
  • Eating uncooked food that contains Giardia organisms
  • Having contact with someone who is ill with giardiasis

If you experience diarrhea and have been in any of the situations described below1, you should contact your doctor to find out if you have a Giardia infection:

  • Travelers to countries of the world that have poor sanitation where giardiasis is common
  • People in child care settings
  • Those who are in close contact with someone who has the disease
  • People who swallow contaminated drinking water
  • Backpackers or campers who drink untreated water from lakes or rivers
  • People who have contact with animals who have the disease
  • People exposed to human feces (poop) through sexual contact

For further information please refer to: Centers for Disease Control and Prevention website at

Indications for Alinia®

Alinia Tablets (patients 12 years of age and older) and Alinia for Oral Suspension (patients 1 year and older) are indicated for the treatment of diarrhea caused by Cryptosporidium parvum or Giardia lamblia.

Alinia Tablets and Alinia for Oral Suspension have not been shown to be superior to placebo for the treatment of diarrhea caused by Cryptosporidium parvum in HIV-infected or immunodeficient patients.

Please note: Alinia is not approved to treat other possible symptoms of Cryptosporidiosis and/or Giardiasis (such as cramps, dehydration, nausea, fever, vomiting). It also is not approved to prevent the spread of infection.

Important Safety Information regarding Alinia®:

  • Do NOT take Alinia Tablets or Alinia for Oral Suspension if you are allergic to nitazoxanide or any other ingredient in the formulations.
  • Alinia Tablets or Alinia for Oral Suspension should be taken with food.
  • If you are a diabetic taking Alinia for Oral Suspension, please be aware that it contains 1.48 grams of sucrose for every 5 mL.
  • Alinia Tablets should NOT be taken by children 11 years or younger.
  • Please discuss with your doctor if you:
    • have hepatic, biliary, or renal disease.
    • are taking any other medications (for example, warfarin).
    • are a pregnant or a nursing woman.
    • are 65 years of age and older.
    • are HIV infected or have an immune disease (such as AIDS).
  • The most common side effects reported for Alinia Tablets during clinical trials were abdominal pain, diarrhea, headache and nausea, which were also reported by patients taking a placebo.
  • The most common side effects reported for Alinia for Oral Suspension during clinical trials were abdominal pain diarrhea, vomiting and headache, which were also reported by patients taking a placebo. These were typically mild and transient in nature. Of the 613 patients in pediatric trials, none discontinued therapy due to adverse events.

For more information, please read the Full Prescribing Information.

You are encouraged to report negative side effects of prescription drugs to the FDA. Visit, or call 1-800-FDA-1088, or contact Romark at 1-813-282-8544.


  1. Giardiasis Information. Accessed May 30, 2014.

Alinia® is a trademark of Romark, L.C.

Intended only for residents of the United States of America. ©2017 Romark, L.C., Tampa, Florida 33607-8416

The information contained in this website is provided for educational purposes only and is not intended to replace discussions with a healthcare provider. Alinia® is not right for everyone. Decisions regarding healthcare must be made with a healthcare provider, considering the unique characteristics of the patient.

RM-AL-018-03V2 R03.16