NOBIVAC RABIES VACCINE

Indications

• Dehydration
• Fluid replacement therapy
• Support for metabolic processes

Dosage

Children: Hydration needs for children vary by age, size, and activity level. It is essential to ensure adequate fluid intake, particularly in hot weather or during illness. Refer to specific guidelines for age-appropriate hydration.

Adults: The dosage of water varies based on individual needs, activity level, and environmental conditions. General recommendations suggest about 2 to 3 liters per day for adults, but this may vary.

Mechanism of action

Water acts as a solvent and medium for biochemical reactions in the body. It facilitates the transport of nutrients and waste products across cell membranes and is involved in hydrolysis reactions that are critical for metabolism.

Pharmacodynamics

Water helps maintain cellular function and integrity. It plays a key role in physiological processes such as thermoregulation, lubrication of joints, and nutrient absorption. Proper hydration is essential for optimal physical and cognitive performance.

Pharmacokinetics

Water is absorbed primarily in the gastrointestinal tract, particularly in the small intestine. It is distributed throughout the body and is involved in various metabolic pathways. The elimination of excess water occurs primarily through the kidneys in the form of urine, with some loss through perspiration and respiration.

Pregnancy

The safety of 2h2o during pregnancy has not been well established. Consult a healthcare professional before use.

Breast-feeding

It is unclear if 2h2o is excreted in human milk. Consult a healthcare professional before use during breastfeeding.

Storage

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

Indications

• Vaccination against infectious diseases
• Allergy testing and immunotherapy
• Monoclonal antibody production
• Transplantation to prevent organ rejection

Dosage

Children: Dosing of antigens in children also depends on the specific antigen and the clinical indication. For pediatric vaccinations, refer to the BNF for Children.

Adults: Dosing of antigens is highly variable and depends on the specific antigen and the clinical indication. For vaccine administration, refer to national immunization guidelines.

Mechanism of action

Antigens work by binding to specific receptors on the surface of immune cells, such as B cells and T cells. This binding triggers a cascade of immune responses, including the proliferation of specific immune cell populations and the production of antibodies that target the antigen. This process is crucial for the development of adaptive immunity, allowing the body to remember and respond more effectively to future encounters with the same antigen.

Pharmacodynamics

The pharmacodynamics of antigens involve the interaction with the immune system to elicit a response. The magnitude and quality of this response can vary based on several factors, including the nature of the antigen, the route of exposure, and the host's immune status. Antigens can be classified as T-cell dependent or T-cell independent, influencing the type of immune response generated.

Pharmacokinetics

Antigens are processed by antigen-presenting cells (APCs) that present peptide fragments to T cells. The pharmacokinetics of antigens can vary widely depending on their form (e.g., live attenuated, inactivated, or subunit vaccines). Generally, once introduced into the body, antigens are taken up by APCs, which then migrate to lymph nodes to activate T and B cells. The duration of immune response can be influenced by the type of antigen and the presence of adjuvants.

Pregnancy

Safety during pregnancy depends on the specific type of antigen. Consult relevant guidelines for specific antigens.

Breast-feeding

Safety during breastfeeding varies by antigen type. Consult relevant guidelines for specific antigens.

Storage

Store at controlled room temperature, away from light and moisture. Specific storage conditions may vary based on the type of antigen.

Indications

• Hepatitis A
• Hepatitis B
• Influenza
• Polio
• Rabies
• Typhoid fever

Dosage

Children: Refer to specific product guidelines for paediatric dosing, as it varies by vaccine type and indication.

Adults: Refer to specific product guidelines for adult dosing, as it varies by vaccine type and indication.

Mechanism of action

Inactivated vaccines work by introducing a form of the pathogen that cannot cause disease into the body. This stimulates the immune system to produce antibodies and memory cells specific to the pathogen, allowing for a robust immune response upon future exposure. The immune system recognizes the inactivated pathogen as foreign, leading to the activation of T-cells and B-cells, which are crucial for long-term immunity.

Pharmacodynamics

The pharmacodynamics of inactivated vaccines involve the generation of an adaptive immune response. After vaccination, the body produces specific antibodies against the inactivated pathogen. The response typically includes both humoral immunity, characterized by antibody production, and cellular immunity, involving T-cell activation. The duration of immunity can vary, and booster doses may be required to maintain adequate protection.

Pharmacokinetics

Inactivated vaccines do not have a pharmacokinetic profile like traditional drugs since they do not enter systemic circulation in the same manner. Following administration, the vaccine components are taken up by antigen-presenting cells, which process and present the antigens to T-cells. The immune response is initiated locally at the site of injection and can be influenced by factors such as the route of administration and the presence of adjuvants that enhance the immune response.

Adverse effects

• Injection site reactions (pain, swelling, redness)
• Fever
• Fatigue
• Headache
• Myalgia
• Chills

Precautions

• Assess for allergies to vaccine components
• Monitor for allergic reactions post-administration
• Consider underlying health conditions that may affect immune response

Pregnancy

Inactivated vaccines are generally considered safe during pregnancy, but individual risk-benefit assessment is recommended.

Breast-feeding

Inactivated vaccines can be administered during breastfeeding without concern for adverse effects in the infant.

Storage

Store in a refrigerator at 2°C to 8°C. Do not freeze.

Formulations

• Inactivated viral vaccines
• Inactivated bacterial vaccines

Indications

• Chronic obstructive pulmonary disease (COPD)
• Asthma
• Hypertension
• Diabetes mellitus
• Chronic heart failure
• Hyperlipidemia

Dosage

Children: Refer to the specific drug's dosing guidelines in the BNF for Children.

Adults: Refer to the specific drug's dosing guidelines in a clinical reference for adult patients.

Mechanism of action

The specific mechanism of action for maintenance therapy varies depending on the drug used. Generally, maintenance medications work by modulating biological pathways to achieve a therapeutic effect without inducing significant side effects. For instance, in the case of maintenance therapy for chronic diseases such as asthma, beta-agonists may relax bronchial smooth muscle, while corticosteroids may reduce inflammation.

Pharmacodynamics

Pharmacodynamics refers to the effects of the drug on the body and the relationship between drug concentration and effect. Maintenance medications often exhibit dose-dependent effects, where the therapeutic response is proportional to the drug concentration within a certain range. The therapeutic window must be carefully monitored to avoid toxicity while ensuring efficacy.

Pharmacokinetics

Pharmacokinetics involves the absorption, distribution, metabolism, and excretion (ADME) of the drug. Maintenance medications typically require a steady-state concentration, which is achieved after consistent dosing. The half-life of the drug plays a crucial role in determining the dosing interval. Drugs used for maintenance therapy may exhibit various absorption rates, bioavailability, and clearance rates that influence their long-term use.

Pregnancy

Consult relevant guidelines as data on safety during pregnancy is limited.

Breast-feeding

Consult relevant guidelines as data on safety during breastfeeding is limited.

Storage

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

Dosage

Children: Refer to specific product guidelines as dosage will depend on the type of medium and its intended application.

Adults: Refer to specific product guidelines as dosage will depend on the type of medium and its intended application.

Mechanism of action

The mechanism of action for a medium can vary greatly depending on the specific medium being referenced. Generally, media serve to maintain the stability and viability of cells or organisms during culture, enabling metabolic processes to occur. For instance, nutrient media provide essential nutrients, while selective media may inhibit the growth of certain organisms while promoting others.

Pharmacodynamics

Pharmacodynamics is largely dependent on the type of medium used and its components. In tissue cultures, the medium can influence cell growth, differentiation, and physiological responses. The interactions of cells with their environment are critical for cellular signaling and function.

Pharmacokinetics

Pharmacokinetics is not typically applicable to media in the same way it is for active drugs. However, the absorption and distribution of substances within a medium can affect how well the active ingredients are delivered or how organisms interact with the medium. Factors such as pH, osmolarity, and nutrient concentration can all influence these processes.

Pregnancy

Consult a healthcare provider before use, as the safety of medium in pregnancy has not been established.

Breast-feeding

Consult a healthcare provider before use, as it is unknown whether medium passes into breast milk.

Storage

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

Indications

• Hypophosphatemia
• Electrolyte replacement
• Buffering agent in various formulations
• Preparation of phosphate solutions for intravenous administration

Dosage

Children: Dosage should be determined based on clinical need and professional guidelines, referring to specific pediatric dosing recommendations.

Adults: Dosage varies based on the clinical condition being treated, and professional guidelines should be consulted for appropriate dosing.

Mechanism of action

Disodium hydrogen phosphate dissociates in solution to release phosphate ions (PO4^3-). These phosphate ions play a crucial role in various biochemical processes, including energy metabolism as part of ATP, nucleic acid synthesis, and cellular signaling. The buffering capacity of Na2HPO4 helps maintain physiological pH levels in biological fluids.

Pharmacodynamics

Phosphate is essential for numerous biological functions, including bone mineralization, cellular energy transfer, and acid-base balance. Na2HPO4 acts as a buffer, helping to stabilize pH levels in the blood and other fluids, which is vital for proper cellular function and metabolic processes.

Pharmacokinetics

Disodium hydrogen phosphate is absorbed in the gastrointestinal tract when ingested. The phosphate ions are distributed throughout the body and are primarily excreted by the kidneys. The pharmacokinetics of Na2HPO4 can vary based on the individual’s renal function, dietary intake, and overall health status.

Adverse effects

• Gastrointestinal disturbances
• Nausea
• Vomiting
• Diarrhea
• Abdominal pain
• Electrolyte imbalances

Precautions

• Use with caution in patients with renal impairment
• Monitor electrolyte levels during therapy
• Assess for signs of hyperphosphatemia

Pregnancy

Consult healthcare provider before use. Safety has not been established.

Breast-feeding

Consult healthcare provider before use. Safety has not been established.

Storage

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

Formulations

• Oral tablet
• Injectable solution

Indications

• Hypophosphatemia
• Bowel preparation prior to colonoscopy
• Phosphate replacement therapy

Dosage

Children: Refer to the BNF for Children and specific clinical protocols for appropriate dosing in pediatric patients.

Adults: Refer to specific clinical guidelines and protocols for dosing based on the indication, as doses can vary significantly.

Mechanism of action

Sodium dihydrogen phosphate dissociates in solution to provide phosphate ions. These ions play a critical role in numerous biochemical pathways, including ATP synthesis, which is vital for energy transfer within cells. The phosphate ions also contribute to the regulation of acid-base balance in the body.

Pharmacodynamics

The pharmacodynamics of sodium dihydrogen phosphate involve its role in increasing serum phosphate levels, which can be particularly important in patients with hypophosphatemia. The compound helps in maintaining the normal physiological functions of cells by providing essential phosphate groups for nucleic acids, phospholipids, and ATP, thus supporting overall cellular health and metabolism.

Pharmacokinetics

Sodium dihydrogen phosphate is absorbed in the gastrointestinal tract, where it dissociates into sodium and phosphate ions. The phosphate ions are then utilized or excreted by the kidneys. The onset of action can be relatively quick, given its solubility and the rapid absorption of phosphate ions. The elimination half-life is variable depending on renal function, as phosphate is primarily excreted through the kidneys.

Pregnancy

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

Breast-feeding

Use with caution. It is not known whether it is excreted in human milk.

Storage

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

Dosage

Children: Refer to specific drug formulations and product labels as purified substances can vary widely in their use and dosing.

Adults: Refer to specific drug formulations and product labels as purified substances can vary widely in their use and dosing.

Mechanism of action

The mechanism of action for purified compounds varies widely depending on the specific substance. Generally, purified drugs exert their effects by interacting with specific biological targets, such as receptors, enzymes, or ion channels, leading to a desired therapeutic effect. This interaction can involve binding to receptors to activate or inhibit signaling pathways, modulating enzymatic activity, or altering physiological processes.

Pharmacodynamics

Pharmacodynamics describes the effects of a drug on the body and the relationship between drug concentration and effect. For purified drugs, this can involve dose-response relationships and the time course of their action. The purified form often enhances potency and reduces variability in response among patients, which can lead to more predictable therapeutic outcomes. The overall effect is determined by the drug's affinity for its target, the efficacy of the drug-receptor interaction, and the downstream signaling pathways activated as a result of this interaction.

Pharmacokinetics

Pharmacokinetics involves the absorption, distribution, metabolism, and excretion (ADME) of a drug. For purified substances, absorption can be more efficient due to the absence of impurities that may affect solubility or stability. Distribution may also be enhanced, leading to higher bioavailability. Metabolism can be influenced by the structure of the purified compound, as it may be metabolized more readily by liver enzymes. Excretion typically occurs through the kidneys or liver, depending on the molecular characteristics of the purified drug.

Pregnancy

Consult with a healthcare professional, as the safety of purified forms of medications during pregnancy may vary depending on the specific substance.

Breast-feeding

Consult with a healthcare professional, as the safety of purified forms of medications during breastfeeding may vary depending on the specific substance.

Storage

Store in a cool, dry place, away from light and moisture, and keep out of reach of children.

Indications

• Rabies prevention in individuals at high risk of exposure
• Post-exposure prophylaxis following potential rabies exposure
• Vaccination for travelers to endemic regions

Dosage

Children: Refer to the BNF for Children for specific dosing recommendations for pediatric patients.

Adults: Refer to the BNF for specific dosing guidelines, as it varies based on exposure risk and vaccination history.

Mechanism of action

The rabies vaccine works by stimulating the immune system to produce antibodies against the rabies virus. This is achieved through the introduction of inactivated or attenuated virus particles, which mimic the infection without causing the disease. The immune response generated helps to prevent the virus from causing illness upon subsequent exposure.

Pharmacodynamics

The rabies vaccine induces an adaptive immune response, leading to the production of neutralizing antibodies specific to the rabies virus. This immune memory protects against future infections. The vaccine is typically administered in a series of doses to ensure adequate immune response and long-term protection.

Pharmacokinetics

The pharmacokinetics of the rabies vaccine involve absorption at the injection site, followed by systemic distribution of the antigens. The onset of immunity generally occurs within two weeks after the initial vaccination, with peak antibody levels typically reached within one to two months. The duration of immunity can vary, necessitating booster doses in certain populations.

Interactions

• chloroquine+rabiesvaccine: Severe (decreases efficacy)

Pregnancy

Rabies vaccination is generally considered safe during pregnancy. However, the risks and benefits should be carefully evaluated.

Breast-feeding

Rabies vaccine is not known to cause any adverse effects in breastfeeding. However, consult with a healthcare provider for individual assessments.

Storage

Store the rabies vaccine in a refrigerator at 2-8 degrees Celsius. Do not freeze.

Indications

• Preservative in vaccines
• Antibacterial agent
• Antifungal agent

Dosage

Children: Refer to the BNF for Children for specific dosage guidelines, especially in

Adults: Refer to specific product guidelines or the BNF for detailed dosage information, as thimerosal is primarily used as a preservative in vaccines rather than in therapeutic doses.

Mechanism of action

Thimerosal inhibits sulfhydryl-containing active sites of various enzymes and binds to sulfhydryl compounds, including glutathione and cysteine. It activates the InsP3 calcium channel on the endoplasmic reticulum, leading to the release of intracellular calcium and subsequent cellular functions dependent on calcium signaling. Ethylmercury, the metabolite of thimerosal, is lipophilic and can cross the blood-brain barrier, contributing to its biological effects.

Pharmacodynamics

Thimerosal exhibits antibacterial and antifungal properties, functioning as a preservative in vaccines. Its pharmacological effects are mediated through interactions with cellular thiols and modulation of calcium signaling pathways. The toxic effects of high doses of thimerosal, such as oxidative stress and apoptosis, have been observed in vitro, although the effects of low-dose exposure remain less understood.

Pharmacokinetics

Thimerosal is rapidly metabolized to ethylmercury, which is eliminated from the body more quickly than methylmercury. Ethylmercury has a shorter half-life, leading to limited accumulation and toxic potential when used in vaccine formulations. The octanol/water partition coefficients indicate that both organomercury compounds, including ethylmercury, can primarily exist within cells, allowing them to cross cellular membranes effectively.

Adverse effects

• Hypersensitivity reactions
• Local reactions at injection site
• Neurotoxic effects at high doses
• Possible kidney pathology with toxic quantities

Precautions

• Use with caution in individuals with known hypersensitivity to thimerosal or other mercury compounds
• Monitoring for adverse effects in patients receiving multiple vaccines containing thimerosal

Pregnancy

Thimerosal should be used in pregnant women only if clearly needed, as the effects on fetal development are not fully established.

Breast-feeding

Thimerosal is considered compatible with breastfeeding, but caution is advised due to potential mercury exposure.

Storage

Store in a cool, dry place away from light. Protect from freezing. Ensure proper disposal of any unused or expired vaccine containing thimerosal.

Formulations

• Thimerosal-containing vaccines (various formulations)

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.

Mechanism of action

Although its mechanism of action is not fully understood, thimerosal inhibits sulfhydryl-containing active site of various enzymes and binds to sulfhydryl compounds, including glutathione, cysteine, and sulfhydryl groups of proteins. In addition, thimerosal activates the InsP3 calcium channel on the endoplasmic reticular membrane, thereby triggering the release of intracellular calcium resulting in a calcium-induced calcium-influx of extracellular calcium. Therefore, thimerosal may induce or inhibit various cellular functions that are dependent on the signaling of calcium. Ethylmercury is metabolized to inorganic mercury more rapidly than methylmercury. This difference in metabolism may account for kidney pathology that can result from toxic quantities. Also, whereas the increase in oxidative stress and induction of apoptosis observed in vitro with large doses (405 μg/L to 101 mg/L) of thimerosal may explain its damaging neurological effects. The effects of low-dose ethylmercury are not completely understood to date. It is known, however, that the shorter half-life of ethylmercury (the metabolite of thimerosal) allows for very limited opportunities of ethylmercury derived from thimerosal in vaccines. Ethylmercury is a lipophilic cation that is capable of crossing the blood-brain barrier. The octanol/water partition coefficients of methyl and ethylmercury are 1.4 to 1.8, at intracellular pH and [Cl−], therefore, both organomercury compounds will primarily exist as intracellular lipophilic cations. It has been demonstrated that lipophilic cations accumulate inside mitochondria, in a Nernstian fashion, driven by the steady state membrane potential. As the typical mitochondrial membrane potential of astrocytes and neurons is between 140–170 mV, one would expect the concentration of these organomercury compounds within mitochondria to be approximately 1000 times greater than the cytosolic concentration.

Pharmacodynamics

Thimerosal is an organomercurial compound and derivative of thiosalicyclic acid with antibacterial and antifungal properties. Thimerosal, which consists of approximately 50% mercury by weight, has been one of the most widely used preservatives in vaccines. It is metabolized/degraded to ethylmercury and thiosalicylate. Ethylmercury is an organomercurial that must be carefully distinguished from methylmercury, a closely related substance that has been the focus of many studies. Methylmercury is the type of mercury found in various species of fish. Experimental data demonstrates that the toxicokinetics of thimerosal (ethylmercury) is vastly different from that of methyl-mercury. Thus, methyl-mercury is not a suitable reference for assessing the risk from exposure to thimerosal-derived mercury. Prior to the recent initiative to reduce or eliminate thimerosal from childhood vaccines, the maximum cumulative exposure to mercury via routine childhood vaccinations during the first 6 months of life was 187.5 micrograms. In the most recently formulated vaccines, the maximum cumulative exposure during the first 6 months of life should now be less than 3 micrograms of mercury. Currently, thimerosal may still be used in the early stages of manufacturing of certain childhood vaccines, however, only a trace remains after a chemical purification process. Note that the dose above is indicated for children 1-6 months of age is applicable only in the United States, and other countries may have varying indications.