NOROCLOX DC XTRA 5.4G SYRINGE

Indications

• Rheumatic fever prophylaxis
• Syphilis treatment
• Streptococcal infections
• Prevention of streptococcal infections in patients with rheumatic heart disease

Dosage

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

Adults: Refer to clinical guidelines and local protocols for appropriate dosing, as it varies by indication and patient characteristics.

Mechanism of action

Benzathine penicillin works by inhibiting bacterial cell wall synthesis. It binds to penicillin-binding proteins located inside the bacterial cell wall, disrupting the cross-linking of peptidoglycan layers, which are essential for bacterial cell wall integrity. This leads to cell lysis and ultimately, bacterial death.

Pharmacodynamics

The pharmacodynamics of benzathine penicillin involve its bactericidal activity against susceptible microorganisms. It is particularly effective against Streptococcus pyogenes, which causes conditions like strep throat and rheumatic fever. The drug maintains therapeutic levels for an extended period, which is advantageous in preventing reinfection in certain clinical settings.

Pharmacokinetics

Benzathine penicillin is administered intramuscularly, where it is slowly absorbed into systemic circulation. Peak plasma concentrations occur within several hours post-injection, and the drug has a prolonged half-life, allowing for sustained therapeutic levels. The elimination of benzathine penicillin primarily occurs through renal excretion, and the duration of action can last several weeks, depending on the dose and the individual's renal function.

Contra-indications

• Hypersensitivity to benzathine penicillin or any component of the formulation
• History of severe allergic reactions to penicillins
• Severe renal impairment

Adverse effects

• Allergic reactions, including anaphylaxis
• Local reactions at the injection site, such as pain, swelling, or induration
• Nausea and vomiting
• Diarrhea
• Rash or urticaria
• Fever
• Hemolytic anemia

Interactions

• Probenecid may increase the serum concentrations of benzathine penicillin
• Oral contraceptives may have reduced efficacy when taken with antibiotics, including benzathine penicillin
• Anticoagulants may have altered effects when used concurrently

Precautions

• Use with caution in patients with a history of asthma or allergies
• Monitor for signs of anaphylaxis after administration
• Renal function should be assessed before use
• Consider potential for superinfection with prolonged use

Pregnancy

Benzathine penicillin is generally considered safe during pregnancy and is used to treat syphilis and other infections.

Breast-feeding

Benzathine penicillin is excreted in breast milk but is not expected to cause harm to a breastfeeding infant.

Storage

Store in a cool, dry place, protected from light. Do not freeze.

Formulations

• Benzathine penicillin G injection

Indications

• Skin and soft tissue infections caused by susceptible Staphylococcus species
• Bone and joint infections (e.g., osteomyelitis) due to Staphylococcus
• Endocarditis prophylaxis in patients with penicillin-sensitive organisms
• Respiratory tract infections caused by susceptible organisms

Dosage

Children: For children, the dosage of cl

Adults: The usual adult dose for cloxacillin is 250 mg to 500 mg every 6 hours, depending on the severity and type of infection. Higher doses may be required for more severe infections.

Mechanism of action

Cloxacillin exerts its antibacterial effects by binding to specific penicillin-binding proteins (PBPs) located within the bacterial cell wall. This binding inhibits the third and final stage of bacterial cell wall synthesis, leading to cell lysis mediated by bacterial autolytic enzymes such as autolysins. Cloxacillin is particularly effective against strains that produce penicillinase, thus broadening its spectrum of activity compared to penicillin.

Pharmacodynamics

As a semisynthetic penicillin, cloxacillin exhibits bactericidal activity, primarily targeting Gram-positive bacteria. Its action is contingent upon the bacteria being in a multiplying state since penicillins do not affect existing cell walls. Cloxacillin's effectiveness is enhanced against beta-lactamase producing strains, allowing for successful treatment of infections that would otherwise be resistant to standard penicillin.

Pharmacokinetics

Cloxacillin is well absorbed from the gastrointestinal tract, with peak plasma concentrations occurring approximately 1 to 2 hours after oral administration. It has a volume of distribution that indicates good tissue penetration, and it is metabolized in the liver. The elimination half-life is approximately 0.5 to 1 hour, with renal excretion being the primary route of elimination for the unchanged drug.

Contra-indications

• History of hypersensitivity to cloxacillin or any other penicillin antibiotics
• Severe renal impairment
• History of allergic reactions to beta-lactam antibiotics

Adverse effects

• Allergic reactions (rash, urticaria, anaphylaxis)
• Gastrointestinal disturbances (nausea, vomiting, diarrhea)
• Hepatic dysfunction (elevated liver enzymes)
• Renal impairment (nephrotoxicity)
• Hematological reactions (eosinophilia, thrombocytopenia)

Interactions

• Probenecid may increase serum levels of cloxacillin
• Anticoagulants (may increase effect)
• Other antibiotics (may have antagonistic effects)

Precautions

• Use with caution in patients with renal impairment
• Monitor for signs of allergic reactions
• Caution in patients with a history of gastrointestinal disease, particularly colitis

Pregnancy

Cloxacillin is generally considered safe to use during pregnancy, but it should only be used when clearly needed.

Breast-feeding

Cloxacillin is excreted in breast milk; caution is advised when administering to nursing mothers.

Storage

Store in a cool, dry place away from light. Once reconstituted, it should be stored in the refrigerator and used within a specified time frame as per manufacturer instructions.

Formulations

• Capsules
• Injection (vial for intravenous use)
• Oral suspension

Indications

• Fluid and electrolyte replenishment
• Management of hyponatremia
• Induction of abortion in specific medical circumstances

Dosage

Children: Refer to the BNF for Children for appropriate dosing information for pediatric patients.

Adults: Refer to the BNF for specific dosing guidelines based on clinical context and condition being treated.

Mechanism of action

Sodium and chloride, as major electrolytes in the extracellular fluid, work together to control extracellular volume and blood pressure. Disturbances in sodium concentrations are linked to disorders of water balance. Intra-amniotic instillation of hypertonic sodium chloride may induce uterine contractions, leading to abortion, potentially mediated by prostaglandins released from damaged decidual cells.

Pharmacodynamics

Sodium, the principal cation in extracellular fluid, is critical for regulating water distribution, fluid balance, and osmotic pressure in body fluids. It works in conjunction with chloride and bicarbonate to maintain acid-base equilibrium. Chloride, as the major extracellular anion, mirrors sodium metabolism, and alterations in acid-base balance are reflected in chloride concentrations.

Pharmacokinetics

Sodium and chloride ions are absorbed from the gastrointestinal tract and distributed throughout the body fluids. Their concentration in extracellular fluid is tightly regulated by mechanisms involving renal excretion and hormonal control, primarily through aldosterone. Changes in dietary intake can also influence sodium levels significantly.

Pregnancy

Intra-amniotic instillation of hypertonic sodium chloride is associated with abortion and fetal death. Caution is advised during pregnancy.

Breast-feeding

Sodium is considered safe during breastfeeding as it is an essential electrolyte.

Storage

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

Formulations

• 20% sodium chloride injection

Mechanism of action

By binding to specific penicillin-binding proteins (PBPs) located inside the bacterial cell wall, cloxacillin inhibits the third and last stage of bacterial cell wall synthesis. Cell lysis is then mediated by bacterial cell wall autolytic enzymes such as autolysins; it is possible that cloxacillin interferes with an autolysin inhibitor. ...ITS ANTIBACTERIAL SPECTRUM AGAINST GRAM-POSITIVE BACTERIA IS LIKE THAT OF PENICILLIN EXCEPT IT IS BROADER BY MARGIN OF THOSE STRAINS OR SPECIES THAT PRODUCE PENICILLINASE. ...IT IS LESS ACTIVE THAN PENICILLIN G AGAINST NON-PENICILLINASE-PRODUCING BACTERIA, ESPECIALLY STREPTOCOCCI. /CLOXACILLIN MONOHYDRATE/ SINCE PENICILLIN HAS NO EFFECT ON EXISTING CELL WALLS, BACTERIA MUST BE MULTIPLYING FOR BACTERIAL ACTION OF PENICILLIN TO BE MANIFEST. /PENICILLINS/ The penicillins and their metabolites are potent immunogens because of their ability to combine with proteins and act as haptens for acute antibody-mediated reactions. The most frequent (about 95 percent) or "major" determinant of penicillin allergy is the penicilloyl determinant produced by opening the beta-lactam ring of the penicillin. This allows linkage of the penicillin to protein at the amide group. "Minor" determinants (less frequent) are the other metabolites formed, including native penicillin and penicilloic acids. /Penicillins/ Bactericidal; inhibit bacterial cell wall synthesis. Action is dependent on the ability of penicillins to reach and bind penicillin-binding proteins (PBPs) located on the inner membrane of the bacterial cell wall. Penicillin-binding proteins (which include transpeptidases, carboxypeptidases, and endopeptidases) are enzymes that are involved in the terminal stages of assembling the bacterial cell wall and in reshaping the cell wall during growth and division. Penicillins bind to, and inactivate, penicillin-binding proteins, resulting in the weakening of the bacterial cell wall and lysis. /Penicillins/ TOLERANCE DEVELOPED TO MULTIPLE DOSING. /PENICILLINS/

Pharmacodynamics

Cloxacillin is a semisynthetic antibiotic in the same class as penicillin. Cloxacillin is for use against staphylococci that produce beta-lactamase.

Mechanism of action

Sodium and chloride - major electrolytes of the fluid compartment outside of cells (i.e., extracellular) - work together to control extracellular volume and blood pressure. Disturbances in sodium concentrations in the extracellular fluid are associated with disorders of water balance. Intra-amniotic instillation of 20% sodium chloride injection induces abortion and fetal death. Although the mechanism has not been conclusively determined, some studies indicate that the drug's abortifacient activity may be mediated by prostaglandins released from decidual cells damaged by hypertonic solutions of sodium chloride. Hypertonic sodium chloride-induced uterine contractions are usually sufficient to cause evacuation of both the fetus and placenta; however, abortion may be incomplete in 25-40% of patients. /20% injection/

Pharmacodynamics

Sodium, the major cation of the extracellular fluid, functions primarily in the control of water distribution, fluid balance, and osmotic pressure of body fluids. Sodium is also associated with chloride and bicarbonate in the regulation of the acid-base equilibrium of body fluid. Chloride, the major extracellular anion, closely follows the metabolism of sodium, and changes in the acid-base balance of the body are reflected by changes in the chloride concentration.