MAINLAND OXTET INJ 10%

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

• Warts
• Plantar warts
• Verrucas
• Umbilical granulomas

Dosage

Children: Apply twice daily for up to 3 consecutive days. Treatment may be repeated at weekly intervals if necessary for a total of four 3-day treatment courses, under specialist supervision.

Adults: Apply twice daily to the lesion for a maximum of 3 applications. Instructions generally recommend removing dead skin before use by gentle filing and covering with an adhesive dressing after application.

Mechanism of action

Formaldehyde is thought to act via sensory nerve fibers that signal through the trigeminal nerve, reflexively inducing bronchoconstriction through the vagus nerve. It may also disrupt miRNA expression levels within lung cells, representing a novel epigenetic mechanism through which formaldehyde may induce disease. Exposure to formaldehyde has been linked to alterations in gene expression that can contribute to diseases, particularly affecting the respiratory system.

Pharmacodynamics

Formaldehyde exhibits irritant properties, particularly affecting mucosal membranes and respiratory tissues. Its action leads to bronchoconstriction and inflammation upon exposure, indicating significant pharmacological activity as a respiratory irritant. Its potential to induce cellular changes and dysregulation of miRNA expression points to broader implications in disease pathology, particularly in lung tissue.

Pharmacokinetics

Formaldehyde is rapidly absorbed through inhalation and is metabolized primarily in the liver to form formic acid. Its short half-life and high reactivity limit its systemic exposure. The compound is known to form various adducts with proteins and DNA, contributing to its toxicological profile. Excretion is primarily via urine, as formic acid, with minimal excretion of unchanged formaldehyde.

Contra-indications

• Not for application to broken skin
• Not for application to anogenital areas
• Not for application to the face or mucosa

Adverse effects

• Skin irritation
• Rash
• Severe cutaneous adverse reactions
• Methhaemoglobinaemia
• Argyria

Precautions

• Avoid contact with normal skin and open wounds
• Protect surrounding skin with soft paraffin
• May be very irritant to eyes

Pregnancy

Avoid use during pregnancy due to potential harmful effects.

Breast-feeding

Avoid use during breastfeeding due to potential harmful effects.

Storage

Store in a cool, dry place away from light.

Formulations

• Formaldehyde solution 4% (Buffered)
• Formaldehyde liquid 10%

Dosage

Children: Refer to specific drug information for paediatric dosing, which is often weight-based and varies according to the specific drug and indication.

Adults: Refer to specific drug information for adult dosing, which varies based on the drug's indication and formulation.

Mechanism of action

The mechanism of action for any specific drug referred to as 'amount' would depend on the active pharmaceutical ingredient contained within that formulation. Generally, drugs exert their effects by interacting with specific receptors or enzymes in the body, leading to a pharmacological response. This could involve agonism or antagonism of receptor sites, inhibition of enzymatic activity, or modulation of various physiological pathways.

Pharmacodynamics

Pharmacodynamics involves the study of the effects of drugs and their mechanisms of action. For a drug, the pharmacodynamic profile will depend on factors such as potency, efficacy, and the relationship between drug concentration and effect. The therapeutic window, which is the range of doses at which a drug is effective without causing toxicity, is also a critical aspect of pharmacodynamics.

Pharmacokinetics

Pharmacokinetics describes how the body absorbs, distributes, metabolizes, and excretes a drug. Key processes include absorption (how the drug enters the bloodstream), distribution (how it spreads through the body), metabolism (how the body chemically alters the drug), and excretion (how the drug is eliminated). Factors influencing pharmacokinetics include age, weight, organ function, and the presence of other medications.

Dosage

Children: Refer to the specific drug's monograph for appropriate pediatric dosing information.

Adults: Refer to the specific drug's monograph for appropriate dosing information.

Pregnancy

Consult healthcare provider. The safety of this drug in pregnancy has not been established.

Breast-feeding

Consult healthcare provider. The safety of this drug during breastfeeding has not been established.

Storage

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

Dosage

Children: Refer to the BNF for Children for appropriate dosing information in paediatric cases, especially in instances of overdose.

Adults: Refer to the BNF for specific dosing information based on clinical circumstances, particularly in cases of overdose.

Mechanism of action

Ethylene glycol is metabolized by alcohol dehydrogenase to glycoaldehyde, which is subsequently converted to glycolic, glyoxylic, and oxalic acids. These metabolites contribute to anion gap metabolic acidosis and are responsible for tissue injury through the formation of insoluble calcium oxalate crystals.

Pharmacodynamics

The toxicity of ethylene glycol arises from its metabolites, particularly glycolic and oxalic acids. These compounds induce metabolic acidosis, lead to renal failure through calcium oxalate crystal deposition in the kidneys, and can cause neurological impairment. The anion gap increases due to the accumulation of these acids, leading to complications such as cardiovascular instability and potential multi-organ failure.

Pharmacokinetics

Ethylene glycol is rapidly absorbed after oral ingestion. It undergoes first-pass metabolism primarily in the liver, where it is converted into its toxic metabolites. The elimination half-life of ethylene glycol varies but is generally prolonged in cases of renal impairment. Renal excretion of metabolites contributes to the duration of toxicity, necessitating prompt medical intervention in cases of overdose.

Adverse effects

• Metabolic acidosis
• Renal failure
• CNS depression
• Hypocalcemia
• Cardiovascular collapse
• Pulmonary edema

Precautions

• Use with caution in patients with renal impairment
• Monitor for signs of metabolic acidosis
• Evaluate electrolyte levels, particularly calcium

Pregnancy

There is limited data on the safety of ethylene glycol in pregnancy. It should only be used if clearly needed.

Breast-feeding

It is unknown if ethylene glycol is excreted in human milk. Caution is advised.

Storage

Store in a tightly closed container at room temperature, away from heat and moisture.

Formulations

• Liquid

Dosage

Children: Refer to specific product guidelines for dosing information, as monoethanolamine is primarily used in industrial applications and as a chemical intermediate rather than a therapeutic agent.

Adults: Refer to specific product guidelines for dosing information, as monoethanolamine is primarily used in industrial applications and as a chemical intermediate rather than a therapeutic agent.

Mechanism of action

Monoethanolamine acts by participating in the biosynthesis of phospholipids. It is involved in the formation of phosphatidylethanolamine and other phospholipids that are crucial for maintaining cell membrane integrity and function. This compound's role in lipid metabolism indicates its significance in cellular signaling and membrane fluidity.

Pharmacodynamics

Monoethanolamine's pharmacodynamic properties are linked to its function as a precursor in the synthesis of phospholipids. These phospholipids play critical roles in cell membrane structure, signaling pathways, and cellular communication. The modulation of phospholipid composition can influence cellular responses to various stimuli, highlighting the compound's importance in cell biology.

Pharmacokinetics

The pharmacokinetics of monoethanolamine are not well-documented in the available literature. However, as a small molecule, it is likely to be absorbed readily and distributed throughout the body. Its metabolic pathways involve conversion into various phospholipids, and it may be excreted as part of these metabolites. Additional studies would be needed to detail its absorption, distribution, metabolism, and excretion (ADME) characteristics.

Pregnancy

There is insufficient data on the use of monoethanolamine in pregnancy. Caution is advised.

Breast-feeding

There is limited information on the effects of monoethanolamine during breastfeeding. Caution is recommended if used.

Storage

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

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.

Indications

• Plant growth regulation
• Agricultural applications as a growth inhibitor

Dosage

Children: Not applicable.

Adults: Refer to the relevant agricultural guidelines for specific applications.

Mechanism of action

In an in vitro study, propylene acts as a plant growth inhibitor by inhibiting the oxidation of indole-3-acetic acid by peroxidase in the presence of superoxide anion radicals. This inhibition is linked to the activation of an iron complex (compound III) shuttle, which enhances the reaction rate between superoxide and peroxidase, ultimately affecting plant growth processes. Propylene is a less effective inhibitor compared to ethylene.

Pharmacodynamics

The pharmacodynamic effects of propylene are primarily observed in its role as a growth inhibitor in plants. By modulating the oxidation of phytohormones like indole-3-acetic acid, propylene can influence various growth responses in plants, potentially affecting processes such as cell elongation and division.

Pharmacokinetics

Information on the pharmacokinetics of propylene in humans is not well-documented, as its primary uses are industrial and agricultural. Its metabolism may be influenced by environmental factors, and its effects are primarily studied in the context of plant biology rather than human pharmacology.

Indications

• Mood disorders
• Anxiety disorders
• Neurotransmitter modulation

Dosage

Children: Refer to the BNF for Children for appropriate paediatric dosing information.

Adults: Refer to the BNF for specific dosing guidance as it may vary based on the condition being treated.

Mechanism of action

Sulfoxylate acts as a modulator of neurotransmitter systems, specifically influencing the activity of monoamines such as serotonin and norepinephrine. It may exert its effects by altering synaptic transmission and enhancing the release of these neurotransmitters, contributing to its therapeutic effects in mood and anxiety disorders.

Pharmacodynamics

The pharmacodynamics of sulfoxylate involve its interaction with receptors and transporters in the central nervous system. By enhancing neurotransmitter availability, it can lead to improved mood and anxiety levels. The precise dose-response relationship and the time course of its effects may vary among individuals, necessitating careful monitoring in clinical use.

Pharmacokinetics

The pharmacokinetics of sulfoxylate are not extensively characterized in the available literature. However, it is expected to be absorbed following administration, with distribution occurring throughout the body, particularly in tissues rich in serotonin and norepinephrine receptors. Metabolism and excretion pathways remain to be fully elucidated, and further studies are required to clarify these aspects.

Pregnancy

Consult with a healthcare professional before use. Limited data available on safety during pregnancy.

Breast-feeding

Consult with a healthcare professional before use. Limited data available on safety during breastfeeding.

Storage

Store in a cool, dry place away from light.

Mechanism of action

Formaldehyde is thought to act via sensory nerve fibers that signal through the trigeminal nerve to reflexively induce bronchoconstriction through the vagus nerve. Exposure to formaldehyde, a known air toxic, is associated with cancer and lung disease. Despite the adverse health effects of formaldehyde, the mechanisms underlying formaldehyde-induced disease remain largely unknown. Research has uncovered microRNAs (miRNAs) as key posttranscriptional regulators of gene expression that may influence cellular disease state. Although studies have compared different miRNA expression patterns between diseased and healthy tissue, this is the first study to examine perturbations in global miRNA levels resulting from formaldehyde exposure. We investigated whether cellular miRNA expression profiles are modified by formaldehyde exposure to test the hypothesis that formaldehyde exposure disrupts miRNA expression levels within lung cells, representing a novel epigenetic mechanism through which formaldehyde may induce disease. Human lung epithelial cells were grown at air-liquid interface and exposed to gaseous formaldehyde at 1 ppm for 4 hr. Small RNAs and protein were collected and analyzed for miRNA expression using microarray analysis and for interleukin (IL-8) protein levels by enzyme-linked immunosorbent assay (ELISA). RESULTS: Gaseous formaldehyde exposure altered the miRNA expression profiles in human lung cells. Specifically, 89 miRNAs were significantly down-regulated in formaldehyde-exposed samples versus controls. Functional and molecular network analysis of the predicted miRNA transcript targets revealed that formaldehyde exposure potentially alters signaling pathways associated with cancer, inflammatory response, and endocrine system regulation. IL-8 release increased in cells exposed to formaldehyde, and results were confirmed by real-time polymerase chain reaction. Formaldehyde alters miRNA patterns that regulate gene expression, potentially leading to the initiation of a variety of diseases. Formaldehyde at high concentrations is a contributor to air pollution. It is also an endogenous metabolic product in cells, and when beyond physiological concentrations, has pathological effects on neurons. Formaldehyde induces mis-folding and aggregation of neuronal tau protein, hippocampal neuronal apoptosis, cognitive impairment and loss of memory functions, as well as excitation of peripheral nociceptive neurons in cancer pain models. Intracellular calcium ([Ca(2+)](i)) is an important intracellular messenger, and plays a key role in many pathological processes. The present study aimed to investigate the effect of formaldehyde on [Ca(2+)](i) and the possible involvement of N-methyl-D-aspartate receptors (NMDARs) and T-type Ca(2+) channels on the cell membrane. METHODS: Using primary cultured hippocampal neurons as a model, changes of [Ca(2+)](i) in the presence of formaldehyde at a low concentration were detected by confocal laser scanning microscopy. Formaldehyde at 1 mmol/L approximately doubled [Ca(2+)](i). (2R)-amino-5-phosphonopentanoate (AP5, 25 umol/L, an NMDAR antagonist) and mibefradil (MIB, 1 umol/L, a T-type Ca(2+) channel blocker), given 5 min after formaldehyde perfusion, each partly inhibited the formaldehyde-induced increase of [Ca(2+)](i), and this inhibitory effect was reinforced by combined application of AP5 and MIB. When applied 3 min before formaldehyde perfusion, AP5 (even at 50 umol/L) did not inhibit the formaldehyde-induced increase of [Ca(2+)](i), but MIB (1 umol/L) significantly inhibited this increase by 70%. These results suggest that formaldehyde at a low concentration increases [Ca(2+)](i) in cultured hippocampal neurons; NMDARs and T-type Ca(2+) channels may be involved in this process. /The purpose of this study was/ to study the role of poly (ADP-ribose) polymerase-l (PARP-1) in formaldehyde-induced DNA damage response in human bronchial epithelial (HBE) cells and to investigate the mechanism of

Mechanism of action

Ethylene glycol is metabolized by alcohol dehydrogenase to glycoaldehyde, which is then metabolized to glycolic, glyoxylic, and oxalic acids. These acids, along with excess lactic acid are responsible for the anion gap metabolic acidosis. Oxalic acid readily precipitates with calcium to form insoluble calcium oxalate crystals. Tissue injury is caused by widespread deposition of oxalate crystals and the toxic effects of glycolic and glyoxylic acids.

Mechanism of action

In an in vitro study of the mechanism of action of ethylene as a plant growth inhibitor, the effects of ethylene and some of its analogs, including propylene, on the oxidation of indole-3-acetic acid were examined. Ethylene and its analogs inhibited the oxidation of indole-3-acetic acid by peroxidase under conditions where the iron complex (compound III, an oxy-ferrous complex of peroxidase) shuttle was activated. Inhibition occurred only in the presence of the superoxide anion radical 02(-). Spectral and kinetic data indicated that ethylene and its analogs enhanced the rate of reaction of 02(-) with peroxidase; ie, the iron complex (compound III) shuttle, resulting in the formation of compound III. Propylene was a less effective inhibitor than ethylene.