Caffeine Citrate - Mechanism of Action, Indications, Dosage, and Adverse Drug Reactions

Overview

Caffeine citrate is used for the short-term therapy of apnea of prematurity or AOP (a condition when a premature infant stops breathing for more than 20 seconds), in preterm newborns between 28 and 33 weeks gestational age. This methylxanthine dramatically lowers the proportion of clinically apparent apnea in premature babies. The development of chronic lung illness, the length of time spent on oxygen, the requirement for mechanical ventilation, and other factors may all be reduced by caffeine administration. On April 12, 2000, the Food and Drug Administration (FDA) approved the caffeine citrate oral solution.

Drug Group

Caffeine citrate is a methylxanthine used to treat pain, induce sleepiness, and treat respiratory issues in premature babies. It is categorized as a CNS (central nervous system) stimulant and activates the brain's respiratory centers.

Indications

Caffeine citrate is recommended for short-term apnea management in premature infants between 28 and less than 33 weeks of gestation.

Contraindications

It is not advised for patients who have demonstrated hypersensitivity (exaggerated immune response) to any of the constituents of caffeine citrate.

Dosage Forms and Available Strengths

The caffeine citrate oral solution is available as an intravenous solution (20 mg/mL (milligrams per milliliter) citrate) or oral liquid (20 mg/mL citrate) 20 milligrams of caffeine citrate, equivalent to 10 milligrams of caffeine base, are present in each milliliter (mL) of the solution. The solution has been adjusted to a pH or potential of Hydrogen 4.7 and is clear, colorless, sterile, non-pyrogenic, and free of preservatives.

For Patients

What Is Apnea in Premature Infants?

Premature babies who suffer from apnea experience short pauses in breathing because of brain immaturity and weak muscles that maintain an open airway. A preterm baby's apnea may develop due to additional stressors such as infection, heart or lung issues, low blood count, low oxygen levels, temperature issues, feeding issues, and overstimulation. The symptoms include bradycardia (a slow heart rate), poor color, shallow breathing, and an unwell-looking appearance. Preterm newborns typically have some degree of apnea and are monitored with heart rate and breathing rate sensors.

How Does Caffeine Citrate Work?

Caffeine citrate belongs to the xanthine family and activates the brain's respiratory centers. Because of the increased weight of the citrate moiety, its mechanism of action is similar to that of the caffeine base but at greater doses. Babies breathe better when caffeine citrate disables specific proteins known as adenosine receptors. It is thought to aid in breathing regulation and airway opening. It may also improve the function of the diaphragm muscle, which could help in enhancing breathing in preterm infants.

What Are the Benefits of Caffeine Citrate?

The benefits of caffeine citrate are:

• Treatment of Apnea in Premature Newborns: Apnea, a breathing disorder, is temporarily managed in premature newborns with caffeine citrate. It helps these babies breathe better by blocking specific proteins called adenosine receptors. It is believed that caffeine citrate facilitates respiratory regulation and airway opening. It may also facilitate better breathing by strengthening the diaphragm muscle.

• Central Nervous System Stimulation: Caffeine citrate is one substance that stimulates the central nervous system. It promotes skeletal muscle contraction (diaphragmatic contractility), stimulates central respiratory drive (the intensity of output from respiratory centers, which affects the effort of respiratory muscles), and increases the sensitivity of medullary respiratory centers to carbon dioxide.

• Cognitive Benefits: During mental exhaustion, Caffeine lessens drowsiness and increases alertness and wakefulness. Accuracy, reasoning, memory, reaction time, attention, and other cognitive functions are also enhanced during mentally and physically taxing tasks. Moreover, caffeine helps enhance certain parts of mental function that acute sleep deprivation has damaged.

• Possible Effect on the Health of the Brain: Caffeine in moderation may benefit brain function. It mimics the effects of the neurotransmitter adenosine, which depresses the neurological system. This makes it possible for caffeine to bind to the identical A1 and A2A receptors and prevent the transmission of adenosine's sleepy signal. People feel more aware, motivated, and awake.

How Is Caffeine Citrate Administered?

The patient's weight determines the caffeine citrate oral solution dosage and is typically given once a day. A dosage of 5 mg/kg (milligrams per kilogram) of caffeine citrate is administered orally every 24 hours.

Here are some guidelines for the administration of the caffeine citrate oral solution:

• Give caffeine citrate oral solution at the same time every day.

• Carefully measure the dosages of caffeine citrate and oral liquids. Utilize the measurement tool included with the oral solution containing caffeine citrate.

• People can administer caffeine citrate oral solution orally or through a feeding tube.

• If this oral solution has particles, is leaking, or is cloudy, do not use it.

• If this oral solution changes color, do not use it.

What Are the Side Effects of the Drug?

Caffeine citrate's side effects include

• Nausea, vomiting, and stomach upset.

• Headache.

• Difficulty falling asleep.

• Anxiety (feeling of fear).

• Inadequate nourishment.

• Increased urination.

• Dry or rashy skin.

Because the baby will benefit more from caffeine citrate than there is a chance of negative consequences, the doctor has recommended it. Most people who use caffeine citrate do not experience significant adverse effects. However, people should get medical help right away if any of the following happen:

• Vision changes.

• Trouble breathing.

• Urine production changes.

Caffeine citrate has infrequently been linked to necrotizing enterocolitis, a dangerous stomach disease.

Call the doctor right away if the baby exhibits any of the following symptoms:

• Bloody stools.

• Severe vomiting.

• Bloating in the abdomen.

• Lethargy.

What Are the Things to Inform the Doctor Before Taking Caffeine Citrate?

1. A child allergic to caffeine should not be administered it.

2. Notify the child's physician if they have ever had

• Convulsions (a condition where body muscles relax and contract quickly).

• Cardiac issues.

• Illness of the kidneys or liver.

3. If the mother used Caffeine during the late pregnancy, let the child's doctor know.

4. Babies receiving Caffeine citrate therapy may experience necrotizing enterocolitis (a disease in which part of the colon dies). It is necessary to discuss this risk with the baby's physician.

Dietary Considerations:

Giving infants caffeine-containing foods or drinks, such as chocolate milk or cola, is not recommended.

Missed Dose:

Parents should seek advice from their doctors if they forget to give their child the authorized dosage of Caffeine citrate oral liquid.

Overdose:

Get emergency medical assistance in the event of Caffeine citrate oral solution overdose. Seizures, abnormal blood tests, vomiting, fever, rapid breathing, anxiety, and sleep issues are the symptoms of Caffeine citrate oral solution overdose.

Storage and Handling:

• Seal the Caffeine citrate oral solution in its original container at room temperature, 25 to 32 degrees Celsius (77 to 89.6 degrees Fahrenheit).

• Keep the Caffeine citrate oral solution in a dry place. Keep out of the bathroom.

• The Caffeine citrate oral solution should be kept out of the reach of children and dogs.

Disposal:

Remove any unused or expired Caffeine citrate oral solution medications. Unless instructed otherwise, never pour down a drain or flush a toilet. Inquire with the pharmacist if people have any concerns regarding the proper disposal of medications and follow the FDA's drug take-back programs.

For Doctors

What Are the Pharmacological Actions of Caffeine Citrate?

Pharmacodynamics

Caffeine stimulates the central nervous system, making people more restless and alert. It improves athletic performance, relaxes smooth muscle, and increases heart-muscular contraction. It enhances gastrointestinal motility and encourages the release of stomach acid. To treat migraines, Caffeine is frequently taken with analgesics and ergot alkaloids. It has a minor diuretic effect as well.

Mechanism of Action

Caffeine citrate, a bronchial smooth muscle relaxant, diuretic, CNS stimulant, and heart muscle stimulant, has several impacts on preterm apnea. It stimulates the respiratory center, enhances ventilation, lowers the threshold for hypercapnia, heightens the response to hypercapnia, raises skeletal muscle tone, lessens diaphragmatic tiredness, elevates the metabolic rate, and increases oxygen consumption. Receptor binding tests have shown that caffeine antagonizes adenosine receptors, which are responsible for these actions.

Pharmacokinetics

• Absorption: The study discovered that, following oral administration of 10 mg (milligrams) of caffeine base/kg (base per kilogram), preterm neonates' peak plasma levels for caffeine ranged from 6 to 10 mg/L (milligrams per liter), with the peak concentration time spanning from 30 minutes to two hours, and that this range was unaffected by formula feeding. However, the absolute bioavailability in premature newborns needed to be thoroughly investigated.

• Distribution: Caffeine is rapidly transported into the brain. Preterm newborns' cerebrospinal fluid has almost the same caffeine as their plasma. Compared to adults, newborns have a somewhat greater mean volume of distribution of caffeine (0.8 to 0.9 L/kg (liters per kilogram)) than adults (0.6 L/kg). There is no data on plasma protein binding for newborns or neonates. According to reports, the mean plasma protein binding in vitro in adults is roughly 36 percent.

• Metabolism: The hepatic cytochrome P450 1A2 (CYP1A2) in preterm newborns affects the biotransformation of caffeine. Immature enzyme systems have a poor ability to metabolize caffeine. Theophylline and caffeine undergo interconversion; three to eight percent of the caffeine is predicted to convert, and 25 percent of the caffeine levels after injection of the Theophylline.

• Elimination: Because of the development of the liver and kidneys, newborns eliminate caffeine more slowly. There is an inverse relationship between gestational or postconceptual age and the mean half-life and proportion excreted unaltered in urine. In newborns, the amount excreted (Ae) is 86 percent, and the half-life (T1/2) is three to four days. Caffeine metabolism at nine months is comparable to that of adults, with T1/2 at five hours and Ae at one percent.

Toxicity

In humans, a 10- to 14-gram overdose of caffeine can be lethal during an acute period (150 to 200 mg/kg body weight). Because caffeine stimulates the central nervous system, an overdose can result in seizures. Caffeine use by people with epilepsy or other seizure disorders must be done carefully. Nausea, vomiting, diarrhea, and stomach upset are possible symptoms. Overdosing on energy drinks instead of regular coffee is more likely among individuals who drink them. Whereas severe cases may necessitate intubation for airway preservation, mild overdoses can be treated with symptomatic measures. Seizures may be prevented or treated with benzodiazepines, although hypotension may require IV (intravenous) fluids and vasopressors. Arrhythmias (irregular heartbeat) can be treated with beta-blockers and magnesium, and if necessary, resuscitation and defibrillation are provided.

Drug Interactions

The following medications may interact with Caffeine citrate oral solution:

• Adenosine.

• Dipyridamole.

• Fluvoxamine.

• Cimetidine.

• Lithium.

• Theophylline.

• Emurafenib

Clinical Studies

In a multicenter, randomized, double-blind experiment, 85 preterm infants with apnea of prematurity were treated with caffeine citrate or a placebo. Caffeine citrate loading doses were given intravenously during the experiment, and daily maintenance doses were given orally or intravenously. The infants might be "rescued" with open-label medication if their apnea persisted and the treatment lasted 10 to 12 days. Compared to the placebo, caffeine citrate significantly increased the proportion of patients without apnea on day 2. Because three patients had fewer apnea events per 24-hour period at baseline, they were not included in the efficacy study. The mean number of days with no apnea occurrences for the caffeine citrate group was three, while for the placebo group, it was 1.2. In the caffeine citrate group, the mean number of days with a 50 percent decrease in apnea occurrences was 6.8, while in the placebo group, it was 4.6.

Warnings and Precautions

• Do not use the oral solution if the child is allergic to caffeine citrate or any of its ingredients.

• The physician should be informed of all of the child's medications, including over-the-counter, prescription, natural, and vitamin products.

• Notify the medical professional that the child takes caffeine citrate oral solution.

• Check the blood tests as directed by the doctor. Consult the physician.

• Caffeine citrate oral solution has been linked to necrotizing enterocolitis (a very serious stomach or intestinal condition). This has occasionally been fatal. Consult the physician.

Use in Specific Populations

• Pregnancy: The low prevalence of cleft palate and exencephaly observed in pregnant mice given 50 mg/kg of caffeine during organogenesis suggests that the teratogenicity of caffeine is not a problem when given to neonates. Nonetheless, there are not enough thorough and regulated studies on pregnant women.

• Breastfeeding: As preterm infants metabolize caffeine slowly, breastfeeding mothers of infants taking caffeine citrate should refrain from consuming meals, beverages, and medications that contain caffeine. Most newborns three weeks of age or older tolerate a daily dietary restriction of 300 to 500 mg from their mothers.

• Renal and Hepatic Impairment: Caution should be used while taking caffeine citrate oral solution in newborns with compromised liver or kidney function.