Euvichol-S

Indications

• Acute watery diarrhea caused by cholera
• Severe dehydration due to cholera
• Electrolyte imbalances resulting from cholera

Dosage

Children: Refer to guidelines for specific rehydration protocols and antibiotic choices based on local guidelines.

Adults: Refer to guidelines for specific rehydration protocols and antibiotic choices based on local guidelines.

Mechanism of action

The pathogenicity of Vibrio cholerae is largely due to the cholera toxin (CT), which is an AB toxin. The A subunit of the toxin enters intestinal epithelial cells and activates adenylate cyclase, leading to an increase in cyclic AMP (cAMP) levels. Elevated cAMP causes secretion of chloride ions into the intestinal lumen, accompanied by sodium and water, resulting in profuse watery diarrhea.

Pharmacodynamics

The primary pharmacodynamic effect in cholera treatment is the restoration of fluid and electrolyte balance through rehydration. In cases where antibiotics are used, they reduce the bacterial load and the production of cholera toxin, leading to a decrease in diarrhea and gastrointestinal symptoms. The choice of antibiotic can influence the speed of recovery and the reduction of stool output.

Pharmacokinetics

Cholera treatment focuses on fluid replacement rather than pharmacokinetics of a specific drug. Oral rehydration solutions (ORS) are designed to be absorbed efficiently in the intestines. If antibiotics are administered, pharmacokinetics will vary depending on the specific antibiotic used. Generally, the absorption of orally administered antibiotics can be affected by the state of hydration and intestinal motility in cholera patients.

Adverse effects

• Dehydration
• Electrolyte imbalance
• Hypotension
• Acute kidney injury
• Shock

Precautions

• Monitor hydration status
• Electrolyte replacement may be necessary
• Use with caution in patients with pre-existing renal issues

Pregnancy

Cholera is a severe diarrheal disease. Pregnant women are at increased risk for severe complications if infected. Vaccination may be considered based on risk of exposure.

Breast-feeding

Cholera vaccination is generally considered safe during breastfeeding, but consult health care provider for specific recommendations.

Storage

Store at room temperature, away from moisture and heat. Maintain proper sanitation and hygiene to prevent contamination.

Formulations

• Oral rehydration salts
• Cholera vaccine (inactivated)

Indications

• Prevention of infectious diseases such as measles, mumps, rubella, hepatitis B, influenza, and human papillomavirus (HPV)
• Travel vaccinations for diseases endemic to certain regions
• Vaccination for at-risk populations, such as those with compromised immune systems or specific occupational exposures

Dosage

Children: Dosage varies by vaccine type and age; refer to the BNF for Children for specific dosing information.

Adults: Dosage varies by vaccine type and indication; refer to specific guidelines for each vaccine.

Mechanism of action

Vaccines work by mimicking an infection. They introduce a harmless component of a pathogen (antigen) to the immune system, prompting the body to produce an immune response. This includes the generation of antibodies and memory cells that provide long-term immunity. Upon subsequent exposure to the actual pathogen, the immune system is primed to respond more rapidly and effectively.

Pharmacodynamics

The pharmacodynamics of vaccines involves the activation of both humoral and cellular immunity. Vaccines stimulate B cells to produce antibodies against the pathogen, while T cells are activated to destroy infected cells. This dual response helps to establish immunological memory, which enables a faster and more robust response upon re-exposure to the pathogen.

Pharmacokinetics

Vaccines are administered via various routes, including intramuscular, subcutaneous, and oral. After administration, the antigens are presented to antigen-presenting cells, which activate T cells and stimulate B cell proliferation and differentiation. The half-life of vaccine-induced immunity varies depending on the type of vaccine, with some providing lifelong immunity and others requiring booster doses to maintain protection.

Contra-indications

• Severe allergic reaction (anaphylaxis) to a component of the vaccine
• Severe immunocompromised state for live attenuated vaccines

Adverse effects

• Local reactions at the injection site (pain, redness, swelling)
• Fever
• Fatigue
• Headache
• Muscle pain
• Joint pain
• Nausea

Interactions

• Immunosuppressive medications may reduce vaccine efficacy
• Concurrent administration of some vaccines may require spacing to optimize immune response

Precautions

• History of allergic reactions to vaccines or vaccine components
• Pregnancy (specific vaccines may be contraindicated)
• Moderate to severe acute illness with or without fever

Pregnancy

Consult healthcare provider. Some vaccines are contraindicated during pregnancy, while others are recommended.

Breast-feeding

Generally considered safe, but consult healthcare provider regarding specific vaccines.

Storage

Store in a refrigerator at 2-8°C. Do not freeze. Protect from light.

Formulations

• Liquid suspension for injection
• Lyophilized powder for reconstitution