STAMARIL ATTENUATED YELLOW FEVER VACCINE

Indications

• Measles
• Mumps
• Rubella
• Yellow fever
• Varicella (chickenpox)
• Rotavirus

Dosage

Children: Refer to specific vaccine guidelines for paediatric dosing.

Adults: Refer to specific vaccine guidelines for adult dosing.

Mechanism of action

Attenuated vaccines work by mimicking a natural infection. The weakened pathogen replicates in the body, stimulating the immune system to produce a response against it, which includes the activation of T-cells and the production of antibodies. This prepares the immune system to recognize and fight off the pathogen if exposed in the future.

Pharmacodynamics

The pharmacodynamics of attenuated vaccines involve the interaction of the attenuated pathogen with the host's immune system. Upon administration, the vaccine induces both humoral (antibody-mediated) and cell-mediated immunity. This leads to the development of memory cells that ensure a faster and more effective response upon subsequent exposure to the actual pathogen.

Pharmacokinetics

Attenuated vaccines are generally administered via subcutaneous or intramuscular injection. The pharmacokinetics are characterized by the distribution of the vaccine components within the body, with the attenuated organisms replicating locally and inducing an immune response. The onset of immunity typically occurs within weeks, and the duration of immunity can vary depending on the specific vaccine.

Contra-indications

• Severe immunodeficiency
• Pregnant women (specific live attenuated vaccines)
• Severe allergic reactions to vaccine components

Adverse effects

• Injection site reactions (pain, swelling, redness)
• Low-grade fever
• Malaise
• Rash
• Rare neurological complications (e.g., Guillain-Barré syndrome)

Interactions

• Immunosuppressive agents (may reduce vaccine efficacy)
• Blood products (may interfere with immune response to vaccine)
• Other live vaccines (timing may affect immune response)

Precautions

• History of allergic reactions to previous vaccinations
• Presence of active infections
• Chronic illnesses that may affect immune response

Pregnancy

Live attenuated vaccines are generally contraindicated during pregnancy due to potential risks to the fetus.

Breast-feeding

Most live attenuated vaccines are considered safe during breastfeeding, but caution and consultation with a healthcare provider are advised.

Storage

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

Formulations

• Injectable suspension
• Oral suspension
• Lyophilized powder for reconstitution

Indications

• Fever of various etiologies
• Infection
• Inflammation
• Viral illnesses
• Postoperative recovery

Dosage

Children: Refer to the BNF for Children for appropriate dosing based on age and weight.

Adults: Refer to specific antipyretic guidelines in the BNF, as dosing can vary depending on the medication used.

Mechanism of action

Fever often results from the release of pyrogens, which are substances that induce fever. These pyrogens stimulate the hypothalamus to increase the body's temperature set point. Antipyretics, such as paracetamol, inhibit the enzyme cyclooxygenase (COX), leading to a decrease in prostaglandin synthesis, which in turn lowers the elevated temperature by promoting heat dissipation.

Pharmacodynamics

Antipyretics exert their effects by acting on the hypothalamus to reset the body's temperature regulation. They work to reduce fever by enhancing heat loss from the body (through processes such as vasodilation and sweating) and inhibiting the production of fever-inducing substances. The onset of action for oral antipyretics is typically within 30 minutes to an hour.

Pharmacokinetics

The pharmacokinetics of antipyretic agents like paracetamol involve rapid absorption from the gastrointestinal tract, with peak plasma concentrations occurring within 30 minutes to 2 hours after ingestion. It is metabolized primarily in the liver and has a half-life of about 2 to 3 hours in healthy individuals. Elimination is primarily via renal excretion, with a small fraction excreted unchanged.

Pregnancy

Consult healthcare provider before use. Some antipyretics may be deemed safe, while others may not be recommended during pregnancy.

Breast-feeding

Consult healthcare provider before use. Many antipyretics are generally considered safe during breastfeeding.

Storage

Store at room temperature, away from moisture and heat. Keep out of reach of children.

Indications

• Bacterial infections
• Viral infections
• Epidemiological studies
• Antibiotic resistance monitoring

Dosage

Children: Refer to specific antimicrobial treatment guidelines based on the strain identified and the infection site.

Adults: Refer to specific antimicrobial treatment guidelines based on the strain identified and the infection site.

Mechanism of action

The mechanism of action for a strain depends on the type of microorganism it represents. For pathogenic bacteria, the strain may produce toxins, evade the host's immune response, or possess resistance mechanisms that allow it to survive in the presence of antibiotics. For viruses, strains may exhibit mutations that alter their ability to infect host cells or evade antiviral therapies.

Pharmacodynamics

Pharmacodynamics in the context of strains involves the interaction between the strain and the host's immune system, as well as the effects of specific antimicrobial agents on the strain. These interactions can influence the efficacy of treatments and the development of resistance.

Pharmacokinetics

Pharmacokinetics is not directly applicable to strains themselves but rather to the drugs used to treat infections caused by specific strains. Factors such as absorption, distribution, metabolism, and excretion of antimicrobial agents can vary depending on the strain's characteristics and the site of infection.

Pregnancy

There is limited information on the safety of strain in pregnancy. It is advisable to consult healthcare professionals for guidance.

Breast-feeding

Safety during breastfeeding is not well established. It is recommended to seek medical advice before use.

Storage

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

Indications

• Influenza
• HIV/AIDS
• Hepatitis B and C
• Herpes simplex virus infections
• Cytomegalovirus infections
• COVID-19
• Respiratory syncytial virus infections

Dosage

Children: Refer to specific antiviral agents for dosing guidance.

Adults: Refer to specific antiviral agents for dosing guidance.

Mechanism of action

Viruses infect host cells by attaching to specific receptors on the cell surface. Once inside, they hijack the host cell's machinery to replicate their genetic material and produce viral proteins. New viral particles are assembled and released from the host cell, often destroying the cell in the process. The specific mechanism can vary depending on the virus type, including integration into the host genome in retroviruses or utilizing specific pathways for replication.

Pharmacodynamics

The pharmacodynamics of antiviral agents depend on the specific virus and the mechanism of action. Antiviral drugs may inhibit viral entry into host cells, block viral replication, or prevent the assembly of new virions. The effectiveness of antiviral therapy often relates to the stage of viral replication and the immune response of the host.

Pharmacokinetics

Pharmacokinetics of antiviral drugs varies widely based on the specific medication used. Generally, antiviral agents are absorbed through the gastrointestinal tract and distributed throughout the body. They may undergo hepatic metabolism and are often excreted through the kidneys. The half-life of these drugs can range from a few hours to several days, influencing dosing schedules.

Pregnancy

No specific data available, consult a healthcare professional.

Breast-feeding

No specific data available, consult a healthcare professional.

Storage

Store in a cool, dry place away from light.