TETANUS AND DIPTHERIA

Indications

• Poisoning
• Drug overdose
• Gastrointestinal decontamination

Dosage

Children: Refer to specific guidelines for the substance involved in poisoning or overdose, as doses vary widely based on the clinical scenario.

Adults: Refer to specific guidelines for the substance involved in poisoning or overdose, as doses vary widely based on the clinical scenario.

Mechanism of action

Adsorption occurs when molecules from a liquid or gas phase adhere to the surface of a solid, forming a film. This interaction can be influenced by various forces, including van der Waals forces, hydrogen bonding, and electrostatic interactions. In the context of activated charcoal, for example, it binds to various substances in the gut, preventing their absorption into the bloodstream and facilitating their excretion.

Pharmacodynamics

The pharmacodynamic effects of adsorbed substances depend on the specific material and its intended use. In general, adsorbents can reduce the bioavailability of certain drugs and toxins by binding them within the gastrointestinal tract and thus decreasing their systemic effects. This can be particularly advantageous in cases of poisoning or overdose, where rapid removal of the substance is desired.

Pharmacokinetics

The pharmacokinetics of adsorbed substances are complex and vary significantly depending on the specific adsorbent used. For instance, activated charcoal does not undergo metabolism and is excreted unchanged in the feces. The onset of action is rapid, as the adsorption occurs immediately upon contact in the gastrointestinal tract. The duration of effect depends on the concentration of the adsorbent and the presence of the substance to be adsorbed.

Pregnancy

Adsorbed is generally considered safe during pregnancy, but it should be used only if the potential benefit justifies the potential risk to the fetus.

Breast-feeding

It is not known whether adsorbed is excreted in human milk. Caution should be exercised when administering to nursing mothers.

Storage

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

Indications

• Diphtheria infection
• Prevention in unimmunized individuals
• Post-exposure prophylaxis

Dosage

Children: Refer to guidelines for dosing of diphtheria antitoxin and antibiotics in children, as specific dosages are based on clinical presentation and severity of the disease.

Adults: Refer to guidelines for dosing of diphtheria antitoxin and antibiotics, as specific dosages are based on clinical presentation and severity of the disease.

Mechanism of action

Diphtheria toxin, produced by the bacteria, inhibits protein synthesis in host cells by ADP-ribosylating elongation factor-2 (EF-2), leading to cell death. This toxin is responsible for the clinical manifestations of the disease, including tissue necrosis and systemic effects.

Pharmacodynamics

The primary pharmacodynamic effect of diphtheria toxin is its ability to prevent protein synthesis in host cells. The severity of the disease is related to the amount of toxin produced, the site of infection, and the host's immune response. The immune response generated by vaccination helps neutralize the toxin and prevents the disease.

Pharmacokinetics

Diphtheria toxin is not absorbed systemically when produced locally in the throat. In cases of systemic absorption, the toxin can spread through the bloodstream, affecting multiple organ systems. The half-life of the toxin in circulation is variable, dependent on the severity of the infection and the immune response. Antitoxin therapy can neutralize the effects of the toxin, but does not reverse damage already done.

Pregnancy

Consult with a healthcare provider before use. The safety of Diphtheria vaccine during pregnancy has not been established.

Breast-feeding

Consult with a healthcare provider before use. It is generally considered safe to administer during breastfeeding.

Storage

Store at 2-8 degrees Celsius. Do not freeze. Protect from light.

Formulations

• Diphtheria toxoid vaccine

Indications

• Tetanus prophylaxis
• Treatment of tetanus infection
• Management of tetanus symptoms

Dosage

Children: Refer to the specific guidelines for tetanus immunoglobulin and other supportive treatments as per clinical protocols.

Adults: Refer to the specific guidelines for tetanus immunoglobulin and other supportive treatments as per clinical protocols.

Mechanism of action

The tetanus toxin binds to the presynaptic membrane of motor neurons and is transported retrogradely to the spinal cord, where it interferes with neurotransmitter release, particularly inhibiting the release of glycine and gamma-aminobutyric acid (GABA), leading to unopposed motor neuron activity and resultant muscle rigidity and spasms.

Pharmacodynamics

Tetanus toxin is one of the most potent toxins known, with effects that can manifest within hours of exposure. The toxin's ability to block inhibitory neurotransmitter release results in a state of continuous muscle contraction, known as tetany. The clinical presentation of tetanus includes trismus (lockjaw), muscle rigidity, and autonomic instability, among others.

Pharmacokinetics

The pharmacokinetics of tetanus toxin are complex due to its high potency and the nature of its action. Following entry into the body, the toxin binds to nerve endings and is internalized, leading to its effects on neurotransmitter release. The half-life of the toxin is not well defined as it does not circulate freely in the bloodstream but acts locally at the neuromuscular junction. Recovery from the effects of the toxin may take weeks to months, depending on the severity of the infection and the treatment provided.

Adverse effects

• Pain at the injection site
• Fever
• Fatigue
• Headache
• Nausea

Precautions

• Ensure patient is up to date with vaccinations
• Monitor for allergic reactions post-vaccination
• Consider history of neurological disorders

Pregnancy

Tetanus vaccination is considered safe during pregnancy and is recommended to protect both the mother and the newborn.

Breast-feeding

Tetanus vaccination is safe during breastfeeding and does not affect the nursing infant.

Storage

Store in a refrigerator at 2–8 degrees Celsius. Do not freeze.

Formulations

• Tetanus toxoid vaccine