Linzess

Approved Uses

Linzess is used to treat the following gastrointestinal conditions:

• Irritable Bowel Syndrome with Constipation (IBS-C): This medication is approved for use in adults and children 7 years of age and older to help relieve stomach pain and increase the frequency of bowel movements.
• Chronic Idiopathic Constipation (CIC): Linzess is used in adults to treat ongoing constipation that has no known cause. "Idiopathic" means the cause of the constipation is unknown.

This medication works by increasing the amount of fluid in the intestines and speeding up the movement of waste through the gut. This process helps to soften the stool and reduce the abdominal pain and discomfort often associated with these conditions.

Mechanism of Action

Linzess belongs to a class of medications called guanylate cyclase-C (GC-C) agonists. It works locally within the intestines and is not significantly absorbed into the rest of the body.

The medication performs two primary functions to treat constipation and related symptoms:

• Increasing Fluid Secretion: Linzess binds to specific receptors on the lining of the intestinal wall. This action triggers the release of chloride and water into the intestines, which helps soften the stool and increases the volume of intestinal contents.
• Improving Motility: By increasing fluid levels, the medication helps speed up the movement of food and waste through the stomach and intestines, leading to more frequent bowel movements.

In addition to improving bowel regularity, Linzess may help relieve abdominal discomfort. Research suggests it can decrease the activity of pain-sensing nerves in the intestines, which may reduce the sensitivity to pain often associated with conditions like irritable bowel syndrome with constipation.

Common Side Effects

The most common side effect of Linzess is diarrhea, which typically begins within the first two weeks of treatment. Other common side effects include:

• Stomach-area (abdominal) pain
• Gas
• Bloating
• A feeling of fullness or pressure in the stomach

Serious Side Effects

Stop taking Linzess and contact a healthcare provider immediately if you experience any of the following serious side effects:

• Severe diarrhea
• New or worsening stomach pain
• Bright red blood in your stool or black, tarry stools

Dehydration

Severe diarrhea can cause the body to lose too much fluid, leading to dehydration. You should monitor for signs of dehydration, such as:

• Dizziness or lightheadedness
• Fainting
• Decreased urination
• Dark-colored urine
• Dry mouth or extreme thirst

Boxed Warning: Pediatric Risk

Linzess contains a boxed warning because it may cause severe dehydration in children. It is contraindicated in children younger than 2 years of age. In laboratory studies, young animals experienced death from dehydration after receiving a single dose. The safety and effectiveness of this medication have not been established in pediatric patients younger than 6 years of age for functional constipation or younger than 7 years of age for irritable bowel syndrome with constipation (IBS-C).

Gastrointestinal Obstruction

This medication should not be used by individuals who have a known or suspected mechanical gastrointestinal obstruction. This refers to a physical blockage in the stomach or intestines that prevents the normal passage of waste.

Severe Diarrhea

Diarrhea is the most common side effect associated with this medication and can sometimes become severe. Severe diarrhea may lead to significant fluid loss and dehydration. If severe or persistent diarrhea develops, it is important to stop taking the medication and contact a healthcare provider immediately. Signs of dehydration may include dizziness, fainting, or feeling very thirsty.

General Precautions

• Pregnancy and Breastfeeding: There is limited data regarding the use of this medication during pregnancy or while breastfeeding. Healthcare providers should be consulted to weigh the potential benefits against possible risks.
• Medical History: Before starting treatment, it is important to disclose any history of stomach or bowel problems to a healthcare professional.

Pregnancy

There is limited information regarding the use of Linzess during pregnancy. Because the medication stays primarily in the gastrointestinal tract and is minimally absorbed into the bloodstream, it is not expected to result in significant exposure to a developing fetus.

Animal studies have not demonstrated harm to the fetus at doses significantly higher than the recommended human dose. If you are pregnant or planning to become pregnant, discuss the risks and benefits of this treatment with your healthcare provider.

Breastfeeding

It is currently unknown if Linzess passes into human breast milk. However, because the drug is not well-absorbed into the mother's system, it is unlikely to be present in breast milk or to cause side effects in a nursing infant.

Consult with your doctor if you are breastfeeding or plan to breastfeed while taking this medication to ensure the best care for you and your baby.

Dosage Forms

Linzess is available as an oral capsule. It is intended for oral use and is typically taken on an empty stomach.

Administration Methods

For individuals who have difficulty swallowing capsules whole, the medication can be administered using alternative methods:

• The capsule can be opened and the contents sprinkled onto room-temperature applesauce.
• The contents can be mixed with water for oral intake.
• The medication can be administered through a feeding tube when prepared with water according to specific instructions.

FDA Approval and Indications

Linzess (linaclotide) is approved by the U.S. Food and Drug Administration (FDA) for the treatment of the following conditions:

• Irritable Bowel Syndrome with Constipation (IBS-C): For use in adult patients.
• Chronic Idiopathic Constipation (CIC): For use in adult patients.
• Functional Constipation: For use in pediatric patients aged 6 to 17 years.

Linzess was first approved for adult use in 2012. In 2023, the FDA expanded the approval to include pediatric patients for functional constipation, making it the first medication approved for this specific condition in children.

Boxed Warning

The FDA has issued a Boxed Warning for Linzess due to the risk of serious dehydration in pediatric patients. The medication is contraindicated in children less than 2 years of age. In animal studies, young mice experienced significant fluid loss and death after receiving a single dose of linaclotide. Because of these risks, healthcare providers are advised to avoid the use of Linzess in patients aged 2 years to less than 6 years, as safety and effectiveness have not been established for this age group.

Regulatory Status

Linzess is a prescription-only medication and is not a controlled substance. It is available as an oral capsule in several strengths. The FDA continues to monitor its safety profile, particularly regarding gastrointestinal side effects such as severe diarrhea, which is the most common reason for discontinuing the medication.

Factors Influencing Price

The out-of-pocket cost for Linzess is determined by your insurance provider's coverage levels and the specific pharmacy you use. Because it is a brand-name medication, it may be placed on a higher cost-sharing tier by insurance companies, which can increase the amount you pay at the pharmacy counter.

Generic Status

There is currently no generic version of Linzess (linaclotide) available in the United States. Generic medications are usually less expensive than brand-name drugs because they do not require the same initial research and development costs. Until a generic version is approved and released, the cost is likely to remain higher than older treatments for similar conditions.

Assistance Programs

Patients may be able to reduce their costs through manufacturer-sponsored savings cards or patient assistance programs. These programs are often designed for individuals with commercial insurance or those who meet specific financial need criteria. You can consult with your healthcare provider or pharmacist to find information on current programs that may help lower the cost of your prescription.