FARMINAZENE PLUS

Indications

• Pain relief
• Fever reduction
• Assessment of drug metabolism

Dosage

Children: Refer to the BNF for Children for specific dosing recommendations for paediatric patients.

Adults: Refer to the BNF for specific dosing recommendations for adults.

Mechanism of action

Antipyrine acts primarily in the central nervous system (CNS) by increasing the pain threshold. It achieves this by inhibiting both isoforms of cyclooxygenase, COX-1, COX-2, and COX-3, which are enzymes involved in the synthesis of prostaglandins (PGs).

Pharmacodynamics

As an analgesic and antipyretic, antipyrine effectively reduces pain and fever. It is administered orally and via ear drops, and is frequently used in clinical settings to evaluate the effects of various drugs or diseases on hepatic drug-metabolizing enzymes.

Pharmacokinetics

Antipyrine is well absorbed from the gastrointestinal tract and undergoes extensive hepatic metabolism. Its elimination half-life varies, influenced by hepatic function and other factors. The drug is primarily excreted in urine as metabolites.

Adverse effects

• Nausea
• Vomiting
• Rash
• Dizziness
• Headache

Precautions

• Use with caution in patients with liver impairment
• Monitor for signs of allergic reactions
• Consider potential interactions with other medications affecting liver enzymes

Pregnancy

Antipyrine should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus.

Breast-feeding

Caution is advised when administered to breastfeeding mothers due to the lack of data on excretion in human milk.

Storage

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

Formulations

• Oral tablets
• Ear drops

Indications

• Muscle spasticity
• Muscle spasms
• Pain management in musculoskeletal disorders

Dosage

Children: Refer to specific pediatric guidelines or consult a healthcare professional for appropriate dosing.

Adults: Refer to specific clinical guidelines or consult a healthcare professional for appropriate dosing.

Mechanism of action

Diaceturate acts by inhibiting the presynaptic release of acetylcholine at the neuromuscular junction, thereby reducing muscle contraction. This inhibition leads to decreased excitability of motor neurons and relaxation of skeletal muscles.

Pharmacodynamics

The pharmacodynamic profile of diaceturate indicates its ability to produce muscle relaxation through central and peripheral mechanisms. It alters neurotransmitter release and modulates synaptic transmission, leading to decreased muscle tone and increased ease of movement. Its effects can be observed within a short time frame following administration, making it effective for acute muscle spasm relief.

Pharmacokinetics

Diaceturate is typically absorbed rapidly after administration, with peak plasma concentrations achieved within a few hours. It undergoes hepatic metabolism, with its metabolites being excreted primarily through the kidneys. The drug has a relatively short half-life, necessitating multiple doses for sustained effect in clinical use.

Adverse effects

• Nausea
• Vomiting
• Diarrhea
• Dizziness
• Rash

Precautions

• Use with caution in patients with liver impairment
• Monitor for allergic reactions
• Caution in patients with renal impairment

Pregnancy

The safety of diaceturate during pregnancy has not been established. It should only be used if the potential benefit justifies the potential risk to the fetus.

Breast-feeding

Caution is advised when using diaceturate in breastfeeding women, as it's unknown if it passes into breast milk.

Storage

Store at room temperature, away from moisture and light. Keep out of reach of children.

Indications

• African trypanosomiasis (sleeping sickness) caused by Trypanosoma brucei gambiense
• African trypanosomiasis (sleeping sickness) caused by Trypanosoma brucei rhodesiense

Dosage

Children: Refer to the BNF for Children for specific dosing recommendations in paediatric patients.

Adults: Refer to the BNF for specific dosing recommendations in adults.

Mechanism of action

Diminazine acts by interacting with the DNA of the protozoan parasites, leading to an inhibition of nucleic acid synthesis. It is thought to inhibit mitochondrial functions, disrupting the energy metabolism of the parasites and ultimately leading to their death. The exact molecular pathways are not fully elucidated, but it is known to interfere with the parasite's ability to replicate and survive in the host.

Pharmacodynamics

Diminazine exhibits a dose-dependent effect on the parasites, leading to a reduction in parasitemia. The drug's effectiveness is enhanced in the early stages of infection, and resistance may develop with prolonged use. The clinical response is monitored through parasitological assessments and symptom resolution, with treatment typically administered in a controlled healthcare setting.

Pharmacokinetics

Diminazine is administered parenterally and is rapidly distributed in the body. It has a moderate volume of distribution and is metabolized in the liver, with renal excretion of its metabolites. The half-life of diminazine varies, generally ranging from 4 to 10 hours, depending on individual patient factors. Therapeutic drug monitoring may be employed to assess plasma concentrations and ensure efficacy while minimizing toxicity.

Pregnancy

Diminazine should only be used during pregnancy if the potential benefit justifies the potential risk to the fetus.

Breast-feeding

It is not known whether diminazine is excreted in human milk. Caution should be exercised when administering to a nursing mother.

Storage

Store in a cool, dry place, protected from light.

Formulations

• {'name': 'Diminazine Aceturate', 'type': 'Injection', 'strength': '100 mg/mL'}

Mechanism of action

Antipyrine is thought to act primarily in the CNS, increasing the pain threshold by inhibiting both isoforms of cyclooxygenase, COX-1, COX-2, and COX-3 enzymes involved in prostaglandin (PG) synthesis.

Pharmacodynamics

Antipyrine is an analgesic and antipyretic that has been given by mouth and as ear drops. Antipyrine is often used in testing the effects of other drugs or diseases on drug-metabolizing enzymes in the liver. (From Martindale, The Extra Pharmacopoeia, 30th ed, p29)