LIT CONTROL PH UP CAPSULES

Indications

• CNS stimulation
• Mild diuresis
• Respiratory stimulation in neonates
• Apnea of prematurity

Dosage

Children: For neonates, particularly in the case of apnea of prematurity, refer to the BNF for Children for appropriate dosing recommendations.

Adults: Refer to the BNF for specific adult dosing guidelines, as dosages may vary based on the indication and clinical context.

Mechanism of action

Theobromine acts primarily as an antagonist at adenosine receptors, inhibiting the actions of adenosine which inhibits neurotransmitter release. This leads to increased neurotransmitter release, resulting in stimulatory effects. Additionally, it stimulates various centers in the medulla, promoting bradycardia, vasoconstriction, and increased respiratory rate. It also increases intracellular cyclic AMP levels by inhibiting phosphodiesterase, which contributes to its physiological effects.

Pharmacodynamics

As a central nervous system stimulant, theobromine enhances alertness and reduces fatigue. It also exhibits mild diuretic effects, promoting increased urine output. Its respiratory stimulant properties make it beneficial in treating conditions like apnea of prematurity in neonates.

Pharmacokinetics

Theobromine is absorbed orally and has a half-life of approximately 6-10 hours in adults, with metabolism occurring primarily in the liver through cytochrome P450 enzymes. The drug is excreted in the urine, with both unchanged theobromine and its metabolites present. The pharmacokinetics may vary based on factors such as age, liver function, and concurrent medications.

Adverse effects

• Nausea
• Vomiting
• Insomnia
• Headache
• Tachycardia
• Nervousness
• Diuresis

Interactions

• May enhance the effects of other CNS stimulants
• Increased clearance may occur with enzyme inducers such as phenobarbital
• May interact with adenosine receptor antagonists

Precautions

• Use with caution in patients with cardiovascular disorders
• Monitor use in patients with a history of seizures
• Caution in patients with renal impairment

Pregnancy

Theobromine is generally not recommended during pregnancy due to potential effects on the fetus. Consult a healthcare provider for advice.

Breast-feeding

Theobromine is excreted in breast milk, and caution is advised when used by nursing mothers.

Storage

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

Formulations

• Oral tablets
• Oral solutions
• Syrups

Mechanism of action

Theobromine stimulates medullary, vagal, vasomotor, and respiratory centers, promoting bradycardia, vasoconstriction, and increased respiratory rate. This action was previously believed to be due primarily to increased intracellular cyclic 3′,5′-adenosine monophosphate (cyclic AMP) following inhibition of phosphodiesterase, the enzyme that degrades cyclic AMP. It is now thought that xanthines such as caffeine and theobromine act as antagonist at adenosine-receptors within the plasma membrane of virtually every cell. As adenosine acts as an autocoid, inhibiting the release of neurotransmitters from presynaptic sites but augmenting the actions of norepinephrine or angiotensin, antagonism of adenosine receptors promotes neurotransmitter release. This explains the stimulatory effects of xanthine derivatives such as theobromine and caffeine. Blockade of the adenosine A1 receptor in the heart leads to the accelerated, pronounced "pounding" of the heart upon caffeine intake.

Pharmacodynamics

Theobromine, a xanthine derivative like caffeine and the bronchodilator theophylline, is used as a CNS stimulant, mild diuretic, and respiratory stimulant (in neonates with apnea of prematurity).