GARDASIL 9

Dosage

Children: Dosage for human-derived biological products in pediatrics should be determined based on specific product guidelines and the clinical context.

Adults: Dosage for human-derived biological products varies widely. Refer to specific product information for appropriate dosing.

Mechanism of action

Human physiology is governed by complex biological systems involving various cellular and molecular pathways. The mechanisms of action for human-derived biological products vary widely depending on the specific context, including immune response, hormonal regulation, and metabolic processes.

Pharmacodynamics

Pharmacodynamics in humans involves the interaction of drugs with biological systems, resulting in therapeutic effects. This includes receptor binding, signal transduction, and physiological responses. The effects are influenced by genetic factors, existing health conditions, and concurrent medications.

Pharmacokinetics

Pharmacokinetics in humans involves the absorption, distribution, metabolism, and excretion (ADME) of substances. Factors such as age, sex, body weight, and organ function can significantly influence these processes. Drug absorption may occur via oral, intravenous, or other routes, while distribution depends on blood flow and tissue permeability. Metabolism typically occurs in the liver, and excretion primarily takes place through the kidneys.

Pregnancy

There is no specific information available; consult local guidelines.

Breast-feeding

There is no specific information available; consult local guidelines.

Storage

Store in a cool, dry place away from direct sunlight.

Indications

• Prevention of cervical cancer
• Prevention of anal cancer
• Prevention of oropharyngeal cancer
• Prevention of genital warts

Dosage

Children: Refer to relevant guidelines for vaccination schedules and administration.

Adults: Refer to relevant guidelines for vaccination schedules and administration.

Mechanism of action

HPV infects epithelial cells and integrates its DNA into the host cell genome. The viral proteins E6 and E7 interfere with host cell cycle regulation, inhibiting tumor suppressor proteins p53 and retinoblastoma (Rb). This leads to uncontrolled cell proliferation and genomic instability, contributing to oncogenesis.

Pharmacodynamics

The immune response to HPV infection can lead to the elimination of the virus in some individuals, while others may develop persistent infections that can progress to dysplasia and cancer. The effectiveness of HPV vaccines is based on their ability to elicit a strong and lasting immune response against the virus, thus preventing the associated diseases.

Pharmacokinetics

HPV is not treated with conventional pharmacological agents, as it is a viral infection that requires preventive measures such as vaccination. The HPV vaccines are administered intramuscularly, leading to systemic circulation of the vaccine components, which stimulate an immune response. The half-life of antibodies generated in response to the vaccine is variable but generally lasts for several years, providing long-term protection.

Adverse effects

• Local reactions at the injection site
• Fever
• Headache
• Fatigue
• Nausea

Precautions

• Caution in patients with a history of allergic reactions to vaccine components
• Consider the risk of fainting after vaccination
• Monitor for any adverse reactions post-vaccination

Pregnancy

The safety of papillomavirus vaccines during pregnancy has not been established. Vaccination is generally not recommended during pregnancy unless the benefits outweigh the risks.

Breast-feeding

There is no evidence suggesting that papillomavirus vaccines pose a risk to breastfeeding infants. Vaccination can be considered.

Storage

Store in a refrigerator at 2 to 8 degrees Celsius. Do not freeze. Protect from light.

Formulations

• Quadrivalent HPV vaccine (types 6, 11, 16, 18)
• Bivalent HPV vaccine (types 16, 18)
• Nonavalent HPV vaccine (types 6, 11, 16, 18, 31, 33, 45, 52, 58)

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