Oxyvet Plus L.A 100ml

Indications

• Bacterial infections (e.g. Chlamydia, Rickettsia, Mycoplasma)
• Acne
• Prophylaxis of asymptomatic meningococcal carrier state (not recommended)

Dosage

Adults: For adult patients, the typical dosage of oxytetracycline for susceptible infections is 100 mg twice daily for 5 days. For other conditions, such as acne, the dosage may be 500 mg twice daily, usually for a duration of 6 to 12 weeks, with the possibility of repeating the course intermittently.

Mechanism of action

Oxytetracycline exerts its antibacterial effects by binding to the 30S ribosomal subunit of bacteria, inhibiting the binding of aminoacyl-tRNA to the mRNA-ribosome complex. This action prevents the synthesis of proteins essential for bacterial growth and replication, leading to the bacteriostatic effect of the drug.

Pharmacodynamics

The pharmacodynamics of oxytetracycline involve its ability to inhibit bacterial protein synthesis, which is critical for the growth and reproduction of bacteria. The drug demonstrates a broad spectrum of activity against both Gram-positive and Gram-negative organisms, as well as some atypical pathogens. Its effectiveness can be influenced by the presence of tetracycline resistance mechanisms in certain bacterial strains.

Pharmacokinetics

Oxytetracycline is well absorbed from the gastrointestinal tract, with peak plasma concentrations occurring approximately 1-2 hours after oral administration. It has a relatively long half-life of about 8-10 hours, allowing for twice-daily dosing. The drug is widely distributed in body tissues and fluids, including the liver, kidneys, and lungs, but is less effective in central nervous system infections due to limited penetration. It is primarily excreted via urine, and dosage adjustments may be necessary in patients with renal impairment.

Contra-indications

• Children under 12 years due to deposition in growing bone and teeth, causing staining and occasionally dental hypoplasia

Adverse effects

• Gastrointestinal disturbances
• Photosensitivity
• Dental discoloration
• Hepatotoxicity
• Renal impairment
• Skin reactions including rash and urticaria
• Ataxia
• Hearing impairment
• Colitis
• Systemic lupus erythematosus exacerbation

Interactions

• Antacids and supplements containing calcium, magnesium, or iron may reduce absorption
• Oral contraceptives may be less effective
• Other tetracyclines
• Warfarin (may increase anticoagulant effect)

Precautions

• Use with caution in patients with renal impairment
• Monitor for hepatic toxicity in long-term use
• Patients should be advised to avoid excessive sunlight exposure
• Discontinue if systemic lupus erythematosus develops or worsens

Pregnancy

Oxytetracycline is contraindicated during pregnancy due to potential harm to fetal development, particularly affecting bone and dental health.

Breast-feeding

Use with caution; oxytetracycline is excreted in breast milk and may affect the infant's dental health.

Storage

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

Formulations

• Oxytetracycline 250 mg tablets
• Oxytetracycline oral suspension
• Oxytetracycline oral solution

Indications

• Pain and inflammation in musculoskeletal disorders
• Rheumatoid arthritis
• Osteoarthritis
• Dysmenorrhea
• Moderate pain relief

Mechanism of action

Ketoprofen's anti-inflammatory effects are primarily due to the inhibition of cyclooxygenase-2 (COX-2), an enzyme crucial for prostaglandin synthesis in the arachidonic acid pathway. This leads to reduced levels of prostaglandins, which mediate pain, fever, and inflammation. Ketoprofen also inhibits cyclooxygenase-1 (COX-1), contributing to its side effects such as gastrointestinal discomfort and ulceration. Additionally, it exhibits anti-bradykinin activity and stabilizes lysosomal membranes. Its antipyretic effects may involve action on the hypothalamus, enhancing peripheral blood flow, vasodilation, and heat dissipation.

Pharmacodynamics

As a nonsteroidal anti-inflammatory agent (NSAIA), ketoprofen shares pharmacological actions with other typical NSAIDs by inhibiting prostaglandin synthesis. It is effective in treating various conditions, including rheumatoid arthritis, osteoarthritis, and dysmenorrhea, and is used to alleviate moderate pain, thus providing both analgesic and anti-inflammatory effects.

Pharmacokinetics

Ketoprofen is absorbed from the gastrointestinal tract, with peak plasma concentrations typically reached within 1 to 2 hours after oral administration. It is extensively metabolized in the liver, primarily through conjugation, and excreted mainly via the urine. The drug has a half-life of approximately 1.5 to 2 hours, but this may vary based on individual factors such as age and liver function. Caution is advised in patients with hepatic or renal impairment, as these conditions may alter the drug's pharmacokinetics and increase the risk of adverse effects.

Contra-indications

• History of gastrointestinal perforation or ulceration
• Severe heart failure
• History of hypersensitivity to aspirin or other NSAIDs

Adverse effects

• Gastrointestinal discomfort
• Nausea
• Constipation
• Dizziness
• Drowsiness
• Fatigue
• Headache
• Rash
• Paraesthesia
• Skin reactions
• Increased risk of infection
• Angioedema
• Renal impairment
• Hypersensitivity reactions
• Photosensitivity
• Hematologic disorders
• Stomatitis
• Tinnitus
• Vision disorders
• Weight increase

Interactions

• May affect performance of skilled tasks such as driving
• Other NSAIDs may increase the risk of adverse effects

Precautions

• Caution in patients with dehydration or renal impairment
• Use with caution in elderly patients due to increased risk of serious side effects
• Careful monitoring required for prolonged therapy
• Caution advised in patients with a history of gastrointestinal disorders

Pregnancy

Avoid unless the potential benefit outweighs the risk. Avoid during the third trimester due to risk of fetal ductus arteriosus closure.

Breast-feeding

Amount probably too small to be harmful, but use with caution and avoid large amounts.

Storage

Store at room temperature, away from moisture and heat.

Formulations

• Oral suspension
• Oral solution
• Suppositories

Mechanism of action

Oxides do not have a single mechanism of action as they are a broad category of compounds. However, in general, metal oxides can exhibit catalytic properties, while non-metal oxides may participate in biochemical reactions by forming acids or bases upon dissolution in water.

Pharmacodynamics

The pharmacodynamics of oxides depend on the specific type of oxide and its interaction with biological systems. For instance, metal oxides may have antimicrobial properties, while certain non-metal oxides can influence metabolic pathways through their acid-base chemistry. The effects vary widely, necessitating specific studies for each oxide's role in therapeutic contexts.

Pharmacokinetics

The pharmacokinetics of oxides are also variable. Many metal oxides are poorly soluble and thus have limited absorption when ingested. Non-metal oxides, such as carbon dioxide, can be readily absorbed and utilized in metabolic processes. The distribution, metabolism, and excretion of oxides depend on their chemical form and the biological system in which they are involved.

Pregnancy

Not applicable as oxide is not a drug but a class of chemical compounds.

Breast-feeding

Not applicable as oxide is not a drug but a class of chemical compounds.

Storage

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

Mechanism of action

The anti-inflammatory effects of ketoprofen are believed to be due to inhibition cylooxygenase-2 (COX-2), an enzyme involved in prostaglandin synthesis via the arachidonic acid pathway. This results in decreased levels of prostaglandins that mediate pain, fever and inflammation. Ketoprofen is a non-specific cyclooxygenase inhibitor and inhibition of COX-1 is thought to confer some of its side effects, such as GI upset and ulceration. Ketoprofen is thought to have anti-bradykinin activity, as well as lysosomal membrane-stabilizing action. Antipyretic effects may be due to action on the hypothalamus, resulting in an increased peripheral blood flow, vasodilation, and subsequent heat dissipation.

Pharmacodynamics

Ketoprofen is a nonsteroidal anti-inflammatory agent (NSAIA) with analgesic and antipyretic properties. Ketoprofen has pharmacologic actions similar to those of other prototypical NSAIDs, which inhibit prostaglandin synthesis. Ketoprofen is used to treat rheumatoid arthritis, osteoarthritis, dysmenorrhea, and alleviate moderate pain.