COVAXIN

Indications

• Constipation
• Irritable bowel syndrome
• Diverticular disease
• Prevention of straining during defecation post-surgery
• Management of stool consistency in patients with fecal incontinence

Dosage

Children: Refer to specific product guidelines for dosing information, as doses may vary depending on the formulation and the child's age and condition.

Adults: Refer to specific product guidelines for dosing information, as doses may vary depending on the formulation and the patient's condition.

Mechanism of action

Bulk-forming agents function by absorbing water in the intestinal lumen, which increases the stool volume. This mechanical effect stretches the intestinal walls, stimulating peristalsis and facilitating bowel movement. Additionally, the hydrated bulk can help to improve stool consistency and reduce the incidence of straining during defecation.

Pharmacodynamics

The pharmacodynamic effects of bulk-forming agents are primarily localized to the gastrointestinal tract. They increase stool bulk and moisture content, which can help to alleviate constipation. The onset of action typically occurs within 12 to 72 hours after ingestion, depending on the specific agent and individual patient factors.

Pharmacokinetics

Bulk-forming agents are not absorbed into the bloodstream and remain within the gastrointestinal tract. They exert their effects locally and are eliminated in the feces. The hydration of the bulk-forming agent occurs within the intestinal lumen, which helps to form a gel-like substance that enhances stool passage without systemic absorption.

Adverse effects

• Gastrointestinal discomfort
• Bloating
• Flatulence
• Diarrhea
• Nausea

Precautions

• Ensure adequate fluid intake to prevent gastrointestinal obstruction.
• Monitor for signs of allergic reactions in sensitive individuals.
• Use cautiously in patients with gastrointestinal disorders.

Pregnancy

Generally considered safe, but consult a healthcare provider for individual assessment.

Breast-feeding

Considered safe, but consult a healthcare provider for individual assessment.

Storage

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

Formulations

• Powder
• Capsules
• Tablets
• Granules

Indications

• COVID-19
• Severe acute respiratory syndrome
• Pneumonia caused by SARS-CoV-2

Dosage

Children: Refer to BNF for Children for appropriate dosing information in paediatric patients.

Adults: Refer to current guidelines and protocols for dosing in adults, as it may vary based on specific treatment regimens and patient conditions.

Mechanism of action

The mechanism of action of SARS-CoV-2 involves the virus binding to the angiotensin-converting enzyme 2 (ACE2) receptor on human cells. This binding facilitates viral entry into the host cell, where the virus utilizes the host's cellular machinery to replicate and propagate. The virus's spike (S) protein plays a critical role in the attachment to the ACE2 receptor, enabling infection.

Pharmacodynamics

Pharmacodynamics of antiviral agents used to treat COVID-19 primarily involves inhibiting viral replication, preventing viral entry into cells, or modulating the host immune response. Drugs such as remdesivir act by inhibiting viral RNA-dependent RNA polymerase, while monoclonal antibodies target the spike protein to neutralize the virus.

Pharmacokinetics

The pharmacokinetics of antiviral treatments for COVID-19 varies by agent. For example, remdesivir is administered intravenously, with a volume of distribution of approximately 60-100 L, and is metabolized by hepatic enzymes. Its half-life is roughly 1 hour, but its active metabolite has a longer effect. Other agents, like monoclonal antibodies, are typically administered via subcutaneous or intravenous routes, with pharmacokinetics influenced by absorption, distribution, metabolism, and elimination processes.

Pregnancy

The use of corona-related treatments during pregnancy should be approached with caution. Consult healthcare providers for guidance based on specific drugs.

Breast-feeding

Consult healthcare providers regarding the safety of corona-related treatments while breastfeeding.

Storage

Store at room temperature, away from light and moisture. Follow specific storage instructions for individual formulations.

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

• Viral infections
• Influenza
• HIV/AIDS
• Hepatitis
• Herpes simplex virus infections
• COVID-19

Dosage

Children: Paediatric dosing for antivirals is also specific to the drug and condition. Refer to established pediatric guidelines or the BNF for Children for accurate dosing.

Adults: Dosing for antiviral medications varies widely based on the specific agent and the condition being treated. Refer to specific drug guidelines for appropriate dosing information.

Mechanism of action

Virions enter host cells via various mechanisms, including receptor-mediated endocytosis or membrane fusion, depending on the type of virus. Once inside the host cell, the viral genome is released and hijacks the host's cellular machinery to replicate and produce new virions. This can lead to cell death or dysfunction, contributing to the pathophysiology of viral infections.

Pharmacodynamics

The pharmacodynamics of antiviral agents targeting virions typically involve inhibiting specific stages of the viral life cycle, such as attachment, entry, uncoating, replication, assembly, or release of virions. This can result in reduced viral load and alleviation of disease symptoms.

Pharmacokinetics

The pharmacokinetics of antiviral medications varies widely based on the specific drug being used. Absorption, distribution, metabolism, and excretion are influenced by the drug's formulation, route of administration, and the presence of food or other substances. Many antivirals have a short half-life, necessitating frequent dosing, while others may have longer duration of action.

Pregnancy

There is limited information regarding the safety of virion in pregnancy. Caution is advised, and it should be used only if the potential benefit justifies the potential risk to the fetus.

Breast-feeding

The effects of virion on breastfeeding are not well established. Caution is recommended, and it should be used only if necessary.

Storage

Store at room temperature, away from light 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.

Dosage

Children: Paediatric dosing for whole products also varies and should be determined by specific products and clinical considerations; consult relevant paediatric pharmacology references for precise information.

Adults: Dosage for whole products is highly variable and should be guided by specific formulations and the clinical context; refer to the appropriate pharmacological references for guidance.

Mechanism of action

The mechanism of action for whole substances varies widely based on the specific plant or compound. Generally, phytochemicals in whole herbs may interact with various biological pathways, such as modulating the immune response, influencing neurotransmitter systems, or exhibiting antioxidant properties. For example, compounds like flavonoids and alkaloids can affect cellular signaling pathways and may impact inflammation, metabolism, or cell proliferation.

Pharmacodynamics

Pharmacodynamics of whole substances also varies greatly. The active compounds may exhibit dose-dependent effects, where low concentrations could stimulate certain biological pathways while higher concentrations may have inhibitory effects. The synergy among multiple components in whole products can enhance efficacy and reduce toxicity compared to isolated compounds, contributing to their therapeutic profiles.

Pharmacokinetics

The pharmacokinetics of whole herbal preparations depend on the specific constituents present. These factors include absorption rates, distribution throughout the body, metabolism (often involving hepatic pathways), and excretion (typically via renal pathways). The complex mixture of compounds can affect bioavailability and the overall pharmacokinetic profile, with some components exhibiting prolonged half-lives or effects due to their interaction with metabolic enzymes.

Pregnancy

The safety of this drug during pregnancy has not been established. Use only if the potential benefit justifies the potential risk to the fetus.

Breast-feeding

It is not known if this drug is excreted in human milk. Caution is advised when administering to nursing mothers.

Storage

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