Meropenem

Common Uses

Meropenem is a broad-spectrum antibiotic used to treat serious infections caused by bacteria. It belongs to a class of drugs known as carbapenems and works by killing bacteria or preventing their growth. Healthcare providers typically prescribe this medication for the following conditions:

• Bacterial Meningitis: This is a serious infection that causes inflammation of the membranes surrounding the brain and spinal cord. Meropenem is used to treat this condition in both adults and children.
• Abdominal Infections: It is used to treat complicated infections within the stomach or abdominal cavity, such as infections related to a ruptured appendix or peritonitis.
• Skin Infections: It treats severe or complicated infections of the skin and the underlying soft tissues.
• Urinary Tract Infections: Certain formulations are used to treat complicated urinary tract infections (cUTI), including serious kidney infections known as pyelonephritis.

This medication is only effective against bacterial infections. It will not work for viral infections, such as the common cold or the flu. Using antibiotics when they are not needed increases the risk of developing an infection later that resists antibiotic treatment.

Mechanism of Action

Meropenem belongs to a class of medications known as carbapenem antibiotics. It works by disrupting the production of the bacterial cell wall. The cell wall is a protective outer layer that bacteria need to maintain their shape and survive. By preventing the bacteria from building or repairing this wall, meropenem causes the bacteria to burst and die.

Broad-Spectrum Activity

This medication is considered a broad-spectrum antibiotic, which means it is effective against a wide variety of both Gram-positive and Gram-negative bacteria. Because of its strength and ability to target many different organisms, it is often used for serious or complex infections, including:

• Bacterial meningitis
• Complicated skin and skin structure infections
• Intra-abdominal infections

Meropenem is specifically designed to treat bacterial infections. It will not work for viral infections, such as the common cold or the flu. Using an antibiotic when it is not needed can lead to antibiotic resistance, making future bacterial infections harder to treat.

Common Side Effects

Some people may experience mild side effects while receiving meropenem. These often include:

• Headache
• Nausea or vomiting
• Diarrhea or constipation
• Pain, redness, or swelling at the site where the medicine was injected
• Rash or itchy skin
• Anemia

Serious Side Effects

Contact a healthcare provider immediately if you experience any of the following serious symptoms:

• Severe stomach pain or watery or bloody diarrhea, which may occur during treatment or several months after the last dose
• Seizures, tremors, or confusion, especially in individuals with kidney problems
• Signs of a serious allergic reaction, such as hives, swelling of the face, lips, or tongue, and difficulty breathing or swallowing
• Severe skin reactions, including blistering, peeling, or a widespread red skin rash
• Mouth sores or white patches in the mouth or throat
• Unusual bleeding or bruising
• Fainting or extreme dizziness

Allergic Reactions

Serious and occasionally fatal hypersensitivity (allergic) reactions have been reported with meropenem. These reactions are more likely to occur in individuals with a history of sensitivity to multiple allergens. Before starting treatment, healthcare providers typically check for previous reactions to penicillins, cephalosporins, other beta-lactams, or carbapenems.

Seizure Risk

Central nervous system adverse effects, such as seizures and tremors, have been reported during treatment. This risk is higher in patients with:

• Pre-existing central nervous system disorders (such as brain lesions or a history of seizures).
• Bacterial meningitis.
• Reduced kidney function.

Drug Interactions

Meropenem can significantly lower the levels of valproic acid or divalproex sodium in the blood. This reduction may increase the risk of breakthrough seizures. Using these medications together is generally avoided unless the benefits of the antibiotic outweigh the risks of reduced seizure control.

Diarrhea and Colitis

Nearly all antibacterial agents, including meropenem, can cause Clostridioides difficile-associated diarrhea (CDAD). This condition can range from mild diarrhea to life-threatening inflammation of the colon. It may occur during treatment or several months after the antibiotic course is finished.

Kidney Function

Because meropenem is cleared by the kidneys, the risk of adverse reactions is higher in patients with impaired renal function. Dosage adjustments are necessary for those with kidney disease. In some cases, patients with kidney impairment may experience thrombocytopenia (low platelet counts) while using this medication.

Development of Drug-Resistant Bacteria

Using meropenem in the absence of a proven or strongly suspected bacterial infection is unlikely to provide benefit and increases the risk of developing drug-resistant bacteria. Prolonged use may also result in the overgrowth of non-susceptible organisms, such as fungi.

Pregnancy

There are no adequate and well-controlled studies regarding the use of meropenem in pregnant women. Animal reproduction studies using high doses of the drug have not shown evidence of harm to the fetus. However, because animal studies are not always predictive of human response, healthcare providers typically only prescribe meropenem during pregnancy if it is clearly needed.

Breastfeeding

Meropenem has been detected in human breast milk. It is currently unknown whether the drug causes adverse effects in nursing infants or if it impacts milk production. If you are breastfeeding or planning to breastfeed, discuss the potential risks and benefits with your healthcare provider to determine the best course of action for you and your child.

Available Forms

Meropenem is available as a sterile powder for injection. This medication must be reconstituted, or mixed with a compatible liquid, by a healthcare professional before it is administered.

Administration Routes

• Intravenous Infusion: The medication is often diluted further and given slowly into a vein over a specific period of time.
• Intravenous Bolus Injection: In some cases, the medication may be given as a more rapid injection directly into a vein.

Meropenem is also available in a combination form with vaborbactam, which is also administered as an intravenous infusion.

FDA Approval Status

Meropenem was first approved by the U.S. Food and Drug Administration (FDA) in 1996. It is classified as a carbapenem antibiotic and is available as a generic medication. The drug is approved for use in both adult and pediatric populations, including infants.

Approved Indications

The FDA has approved meropenem for the treatment of several types of infections when caused by susceptible strains of specific bacteria:

• Complicated intra-abdominal infections.
• Complicated skin and skin structure infections.
• Bacterial meningitis (specifically in pediatric patients aged 3 months and older).

Regulatory Requirements and Safety

Meropenem is not a controlled substance. It is available only by prescription and must be administered intravenously by a healthcare professional. There are currently no Boxed Warnings or Risk Evaluation and Mitigation Strategies (REMS) associated with meropenem.

The FDA monitors the supply of meropenem injection products to manage potential drug shortages, as it is considered a critical anti-infective therapy. In some cases, the FDA has approved the use of specific combination products, such as meropenem and vaborbactam, for more complex infections like complicated urinary tract infections.

FDA-Approved Uses

The U.S. Food and Drug Administration (FDA) has approved meropenem for the treatment of several types of serious infections caused by specific bacteria:

• Complicated Skin and Skin Structure Infections: Approved for both adults and children.
• Complicated Intra-abdominal Infections: Approved for both adults and children.
• Bacterial Meningitis: Approved for children aged 3 months and older.

Regulatory Status

Meropenem was first approved by the FDA in 1996 under the brand name Merrem. Since then, the FDA has approved multiple generic versions of the medication. It is classified as a carbapenem antibiotic and is only available by prescription for intravenous administration.

Additionally, the FDA has approved a combination product containing meropenem and vaborbactam for the treatment of complicated urinary tract infections, including kidney infections (pyelonephritis), in adults.