AVIPOX

Indications

• Prevention of fowlpox in poultry
• Control of fowlpox outbreaks in flocks

Dosage

Children: Refer to vaccination guidelines for specific dosing recommendations in young birds, as this can vary based on the vaccine used.

Adults: Refer to vaccination guidelines for specific dosing recommendations in adult birds, as this can vary based on the vaccine used.

Mechanism of action

The fowlpox virus enters host cells and utilizes the host's cellular machinery to replicate. It induces cell lysis, leading to the release of new virions. The immune response to the fowlpox virus includes both humoral and cellular components, where antibodies are generated against viral antigens, and T-cells respond to infected cells. This immune response helps in controlling the infection and confers protection against future infections.

Pharmacodynamics

Fowlpox elicits a robust immune response in infected birds. The virus is capable of evading certain host immune mechanisms, allowing for persistent infection. The development of antibodies against the virus is critical for recovery and protection against reinfection. Vaccination with live attenuated fowlpox virus induces immunity by exposing the immune system to the virus without causing disease, stimulating both humoral and cell-mediated immunity.

Pharmacokinetics

The pharmacokinetics of the fowlpox virus involve its replication cycle within the host. After entry into the host cell, the virus replicates in the cytoplasm, eventually leading to cell death and the release of new virions. The duration of the viral cycle may vary, but lesions typically manifest within 7 to 14 days post-infection. The immune response develops over a similar time frame, providing gradual protection against the virus.

Pregnancy

The safety of fowlpox vaccination during pregnancy has not been established, and it is typically not recommended for use in pregnant animals.

Breast-feeding

There is limited information regarding the use of fowlpox in breastfeeding scenarios, and caution should be exercised.

Storage

Fowlpox vaccines should be stored in a cool, dry place, typically between 2°C and 8°C, and protected from light. Do not freeze.

Formulations

• Fowlpox vaccine (live attenuated)

Indications

• Induction of anesthesia
• Maintenance of anesthesia during surgery
• Sedation for procedures
• Pain management

Dosage

Children: Dosing in pediatric patients must be determined based on the specific agent and the child's age, weight, and clinical condition. Refer to BNF for Children for precise dosing recommendations.

Adults: Dosing varies widely based on the specific anaesthetic agent and the procedure being performed. Refer to specific guidelines or BNF for exact dosing information.

Mechanism of action

Least-acting anaesthetics primarily exert their effects by enhancing inhibitory neurotransmission, particularly through the modulation of gamma-aminobutyric acid (GABA) receptors. This results in increased chloride ion influx into neurons, leading to hyperpolarization and decreased neuronal excitability. Additionally, these agents may inhibit excitatory neurotransmitter pathways, contributing to their anesthetic effects.

Pharmacodynamics

The pharmacodynamics of least-acting anaesthetics involve a balance between sedation and analgesia, with the goal of achieving an appropriate depth of anesthesia for surgical procedures. The effects are dose-dependent, with lower doses providing sedation and higher doses leading to full anesthesia. The therapeutic window is critical, as excessive doses can lead to respiratory depression and cardiovascular instability.

Pharmacokinetics

Least-acting anaesthetics are generally characterized by rapid absorption and distribution, allowing for quick onset of action. They are metabolized primarily in the liver, with some agents undergoing hydrolysis in the plasma. The elimination half-life can vary significantly among different agents, influencing the duration of action. Factors such as age, liver function, and concurrent medications can affect the pharmacokinetics of these agents.

Pregnancy

Use during pregnancy only if the potential benefit justifies the potential risk to the fetus.

Breast-feeding

Caution is advised; it is recommended to consult a healthcare provider before use.

Storage

Store in a cool, dry place, away from direct light and moisture.

Indications

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

Dosage

Children: Refer to the BNF for Children for specific dosing information based on age and vaccine type.

Adults: Refer to specific product guidelines for dosing information, as it can vary by vaccine type and brand.

Mechanism of action

Live vaccines work by introducing a weakened or attenuated form of a pathogen into the body. This stimulates the immune system to recognize and respond to the pathogen, leading to the production of antibodies and memory cells that provide long-term protection against future infections by the same pathogen.

Pharmacodynamics

The pharmacodynamics of live vaccines involve the activation of both humoral and cellular immunity. Following vaccination, the immune system generates a robust response, including the production of specific antibodies and the activation of T cells that can recognize and eliminate infected cells. This dual action helps establish long-term immunity.

Pharmacokinetics

The pharmacokinetics of live vaccines vary depending on the specific vaccine. Generally, the vaccine is administered via injection, allowing the live attenuated organisms to enter the bloodstream. The immune response typically begins within days and can last for years, depending on the vaccine. Live vaccines are usually stored under refrigeration to maintain their viability, and they should be administered within their expiration dates.

Interactions

• livevaccines + abrocitinib: Severe (increases risk of generalised infection (possibly life-threatening))
• livevaccines + baricitinib: Severe (increases risk of generalised infection (possibly life-threatening))
• livevaccines + filgotinib: Severe (increases risk of generalised infection (possibly life-threatening))
• livevaccines + dexrazoxane: Severe (increases risk of generalised infection (possibly life-threatening))
• livevaccines + iron chelators: Severe (increases risk of generalised infection (possibly life-threatening))
• livevaccines + ozanimod: Severe (increases risk of generalised infection (possibly life-threatening))
• livevaccines + ponesimod: Severe (increases risk of generalised infection (possibly life-threatening))
• livevaccines + siponimod: Severe (increases risk of generalised infection (possibly life-threatening))
• livevaccines + upadacitinib: Severe (increases risk of generalised infection (possibly life-threatening))
• livevaccines + diroximelfumarate: Moderate (increases risk of generalised infection (possibly life-threatening))

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.