BCG VACCINE

Indications

• Vaccination
• Antibiotic therapy
• Hormone replacement therapy
• Enzyme replacement therapy
• Immunotherapy

Dosage

Children: Refer to specific drug information for dosing guidelines, as this varies widely based on the active ingredient and indication.

Adults: Refer to specific drug information for dosing guidelines, as this varies widely based on the active ingredient and indication.

Mechanism of action

Lyophilization itself does not have a mechanism of action, as it is a preservation technique rather than a pharmacologically active process. The mechanism of action of the lyophilized drug will depend on the specific active pharmaceutical ingredient (API) that has been lyophilized. For example, if the lyophilized drug is a vaccine, its mechanism may involve the stimulation of the immune response through the introduction of antigens.

Pharmacodynamics

The pharmacodynamics of a lyophilized drug will vary based on the specific formulation and active ingredients. Generally, once reconstituted, the pharmacodynamic properties will reflect those of the non-lyophilized form. Factors such as bioavailability, receptor binding, and the drug's effects on physiological systems will be determined by the specific drug's characteristics.

Pharmacokinetics

The pharmacokinetics of a lyophilized drug will also depend on the specific API. Once reconstituted, the drug's absorption, distribution, metabolism, and excretion (ADME) profile will align with that of the non-lyophilized version. The freeze-drying process is designed to minimize degradation, maintaining the pharmacokinetic properties of the drug post-reconstitution.

Pregnancy

Safety in pregnancy has not been established. Use only if the potential benefit justifies the potential risk to the fetus.

Breast-feeding

Caution is advised when administering during breastfeeding. The effects on a nursing infant are not known.

Storage

Store in a cool, dry place. Protect from light and moisture. Follow specific storage recommendations for individual formulations.

Adverse effects

• Nausea
• Vomiting
• Rash
• Hepatotoxicity
• Peripheral neuropathy
• Optic neuritis
• Gastrointestinal disturbances

Interactions

• Antiretroviral agents
• Anticoagulants
• Oral contraceptives
• Corticosteroids
• Alcohol

Precautions

• Liver disease
• HIV infection
• Pregnancy
• History of drug allergies
• Renal impairment

Pregnancy

Use with caution. Some antitubercular medications are contraindicated during pregnancy due to potential harm to the fetus.

Breast-feeding

Generally safe, but some drugs may be excreted in breast milk. Consult healthcare providers for specific medications.

Storage

Store in a cool, dry place away from direct sunlight. Keep out of reach of children.

Formulations

• Oral tablets
• Injectable solutions
• Fixed-dose combinations

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