Fenbac Xr
Fenbac Xr Uses, Dosage, Side Effects, Food Interaction and all others data.
Fenbac Xr is a centrally acting skeletal muscle relaxant and an antispastic agent with a spinal site of action.
In neurological diseases associated with spasm of the skeletal muscles, the clinical effects of baclofen occur due to baclofen action on reflex muscle contractions and of significant relief from painful spasm, automatism, as well as clonus. Fenbac Xr, when used as indicated, improves mobility, increasing levels of independence, and facilitates both passive and active physiotherapy. Fenbac Xr also stimulates gastric acid secretion .
GABA-B receptor activation by baclofen may produce protective neurological effects. Fenbac Xr also possesses anti-inflammatory properties that may be of interest in the study of addiction treatment . Preclinical studies have shown that GABA-B receptors have roles in memory storage and retrieval, reward, motivation, mood, as well as anxiety. Neuroimaging studies in humans indicate that baclofen produces region-specific alterations in brain activity.
| Trade Name | Fenbac Xr |
| Availability | Prescription only |
| Generic | Baclofen |
| Baclofen Other Names | Baclofen, Baclofène, Baclofeno, Baclofenum, DL-Baclofen |
| Related Drugs | Botox, dantrolene, trihexyphenidyl, Artane, Lioresal, onabotulinumtoxinA, Lyvispah, Gablofen, Dantrium, Fleqsuvy |
| Type | Tablet |
| Formula | C10H12ClNO2 |
| Weight | Average: 213.661 Monoisotopic: 213.05565634 |
| Protein binding | 30% |
| Groups | Approved |
| Therapeutic Class | Centrally acting Skeletal Muscle Relaxants |
| Manufacturer | Mova Pharmaceuticals Pvt Ltd |
| Available Country | India |
| Last Updated: | September 19, 2023 at 7:00 am |
Uses
Fenbac Xr is used for:
- Spasm.
- Spinal cord diseases.
- Cerebrovascular accidents or neoplastic or degenerative brain disease.
- Muscle spasm of cerebral origin especially infantile cerebral palsy.
- The alleviation of spasticity resulting from multiple sclerosis
Fenbac Xr is also used to associated treatment for these conditions: Joint Pain, Soreness, Muscle, Flexor spasm, Reversible Spasticity, Severe cerebral origin Spasticity, Severe spinal cord origin Spasticity
How Fenbac Xr works
The exact mechanism of action of baclofen is not fully understood at this time , . Many studies indicate that baclofen is a GABA-B receptor agonist , , , , . Despite this, there is no conclusive evidence that the effects of baclofen on GABA systems are involved in the production of its clinical effects .
Fenbac Xr is an effective and widely used antispastic agent with a spinal site of action. Its mechanism of action and pharmacological properties are different from the effects of other antispastic agents. In addition, baclofen has central sites of action, shown by its adverse event profile and general CNS depressant properties . GABA-B receptors interact with signal transduction pathways and neurotransmitter systems. Fenbac Xr exerts an antinociceptive effect. The clinical significance of this warrants further research data for clarification.
Fenbac Xr depresses monosynaptic and polysynaptic reflex transmission, by various actions, and possibly including the stimulation of GABAβ-receptors. This stimulation results in the inhibition of excitatory neurotransmitter (glutamate and aspartate) release, which may normally contribute to pain and spasticity. Although baclofen is an analog of the inhibitory neurotransmitter gamma-amino-butyric acid (GABA), there are no conclusive data indicating GABA systems are involved in its clinical effects .
Dosage
Fenbac Xr dosage
Adults:
Treatment should be started with low dose and increased gradually until optimum effect is achieved. The following dosage titration schedule is suggested:
5 mg 3 times daily for 3 days,
10 mg 3 times daily for 3 days,
15 mg 3 times daily for 3 days,
20 mg 3 times daily for 3 days,
25 mg 3 times daily for 3 days.
Thereafter, additional increases may be necessary. The optimum dosage generally ranges from 30 - 80 mg daily in 3 - 4 divided doses. Daily doses of 100 - 120 mg may be given to carefully supervised patients in hospitals.
Children:
Treatment should be started at a very low dose, e.g., 0.3 mg/kg per day in divided (preferably 4) doses. The dosage should be raised cautiously at 1-2 week intervals until it is sufficient for the child\'s individual needs. The usual dosage range for maintenance therapy is 0.75 to 2 mg/kg body weight per day. In children aged over 10 years a maximum daily dose of 2.5 mg/kg body weight may be given.
Renal Insufficiency:
Fenbac Xr is excreted principally in urine as unchanged drug. So it may be necessary to reduce the dosage in patients with impaired renal function.
Side Effects
The most common side effects include drowsiness, nausea, dizziness, lassitude, lightheadedness, confusion, fatigue, muscular pain & weakness and hypotension.
Toxicity
LD50 after oral administration in rats: 145 mg/kg
Overdosage: Vomiting, muscular hypotonia, drowsiness, accommodation disorders, coma, respiratory depression, and seizures may occur with overdosage .
Pregnancy: This drug is a pregnancy category C drug. There are no adequate and well-controlled studies that have been performed with pregnant women. Fenbac Xr should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus .
Excretion in breastmilk: It is unknown whether this drug is excreted in human breast milk. Because many drugs are excreted in human milk, caution is warranted when baclofen is administered to a nursing woman .
Precaution
Patients suffering from psychotic disorders, schizophrenia, depressive or manic disorders, confusional states or Parkinson\'s disease, should be treated cautiously with Fenbac Xr. Fenbac Xr stimulates gastric acid secretion and should be used with caution in patients with a history of peptic ulcer and avoided in those with active peptic ulcer disease . Liver function should be monitored in patients with liver disease; patients with renal impairment need a reduced dose. Fenbac Xr should be used with caution in patients with respiratory impairment. Observations of increased blood sugar concentrations suggest caution in patients with diabetes mellitus. Care is also required in the elderly, in whom adverse effects may be more common, and in patients with cerebrovascular disease (who tolerate Fenbac Xr poorly). Fenbac Xr may cause drowsiness; patients affected should not drive or operate machinery. Abrupt withdrawal of Fenbac Xr may result in a withdrawal syndrome and exacerbation of spasticity; dosage should be reduced gradually over at least 1 to 2 weeks, or longer if symptoms occur.
Interaction
Alcohol and other CNS depressants may exacerbate the CNS effects of Fenbac Xr and should be avoided. There may be increased weakness if Fenbac Xr is given to patients taking a tricyclic antidepressant and an increased hypotensive effect if it is given to patients receiving antihypertensive therapy.
Food Interaction
- Avoid alcohol.
- Take with food. Take with food or milk to reduce gastric irritation.
[Moderate] GENERALLY AVOID: Alcohol may potentiate some of the pharmacologic effects of CNS-active agents.
Use in combination may result in additive central nervous system depression and
MANAGEMENT: Patients receiving CNS-active agents should be warned of this interaction and advised to avoid or limit consumption of alcohol.
Ambulatory patients should be counseled to avoid hazardous activities requiring complete mental alertness and motor coordination until they know how these agents affect them, and to notify their physician if they experience excessive or prolonged CNS effects that interfere with their normal activities.
Fenbac Xr Drug Interaction
Major: acetaminophen / hydrocodone, acetaminophen / hydrocodoneModerate: duloxetine, duloxetine, pregabalin, pregabalin, alprazolam, alprazolam, cetirizine, cetirizineUnknown: polyethylene glycol 3350, polyethylene glycol 3350, acetaminophen, acetaminophen, cyanocobalamin, cyanocobalamin, ascorbic acid, ascorbic acid, cholecalciferol, cholecalciferol
Fenbac Xr Disease Interaction
Major: renal dysfunctionModerate: autonomic dysreflexia, psychoses, seizure disorders
Volume of Distribution
Apparent volume of distribution: 59 liters .
Fenbac Xr does not readily cross the blood-brain barrier .
Elimination Route
Rapidly and almost completely absorbed from the gastrointestinal tract. Absorption may be dose-dependent, being reduced with increased doses .
Fenbac Xr, when introduced directly into the intrathecal space, allows for effective CSF concentrations to be achieved with resulting plasma concentrations 100 times less than concentrations occurring with oral administration , .
Half Life
Elimination half-life: Approximately 5.5 hours .
Clearance
Total systemic clearance: 180 mL/min Renal clearance: 103 mL/min
Fenbac Xr is primarily excreted unchanged by the kidneys. It should be administered cautiously, and it may be necessary to reduce the dosage in patients with reduced renal function .
Elimination Route
Fenbac Xr is rapidly and extensively eliminated from the body. There is significant intersubject variation in elimination rates. Fenbac Xr is excreted mainly by the kidney as unchanged drug. Seventy to eighty (70 - 80%) of a dose is measured in the urine as unchanged drug. The remainder of the dose is excreted as unchanged drug in the feces or as metabolites in the urine and feces. Excretion is complete within 72 hours after administration .
Pregnancy & Breastfeeding use
There are no adequate and well controlled studies of Fenbac Xr in pregnant women. So it should be used during pregnancy only if the potential benefit outweighs the potential risk to the fetus.
Fenbac Xr is excreted in breast milk. However, evidence suggests that the quantities are so small that no undesirable effect on the infant would be expected.
Contraindication
Fenbac Xr is contraindicated in patients with hypersensitivity to any component of this product.
Special Warning
Renal Insufficiency: Fenbac Xr is excreted principally in urine as unchanged drug. So it may be necessary to reduce the dosage in patients with impaired renal function.
Acute Overdose
Prominent features are signs of central nervous system depression. No specific antidote of Fenbac Xr is known. Elimination of the agent from GI tract, artificial respiration, administration of fluid with a diuretic and dialysis should be considered.
Interaction with other Medicine
Alcohol and other CNS depressants may exacerbate the CNS effects of Fenbac Xr and should be avoided. There may be increased weakness if Fenbac Xr is given to patients taking a tricyclic antidepressant and an increased hypotensive effect if it is given to patients receiving antihypertensive therapy.
Storage Condition
Store in cool & dry place, away from children.
Innovators Monograph
You find simplified version here Fenbac Xr
Fenbac Xr contains Baclofen see full prescribing information from innovator Fenbac Xr Monograph, Fenbac Xr MSDS, Fenbac Xr FDA label
FAQ
What is Fenbac Xr used for?
Fenbac Xr is used to help relax certain muscles in your body. It relieves the spasms, cramping, and tightness of muscles caused by medical problems, such as multiple sclerosis or certain injuries to the spine.
How safe is Fenbac Xr?
Fenbac Xr can cause a severe allergic reaction. Symptoms can include trouble breathing and swelling of your throat or tongue. If you have an allergic reaction, call your doctor or local poison control center right away.
How does Fenbac Xr work?
Fenbac Xr is believed to work by activating (or agonizing) GABA receptors, specifically the GABAB receptors.
What are the common side effects of Fenbac Xr?
Common side effects of Fenbac Xr are include:
- dizziness
- weakness
- confusion
- headache
- nausea
- constipation
- difficulty falling asleep or staying asleep
- tiredness
- frequent urination
Is Fenbac Xr safe during pregnancy?
There is no evidence that taking Fenbac Xr during pregnancy increases the chance of having a baby with birth defects above the background risk. There are also several case reports of children that were exposed to Fenbac Xr during pregnancy and did not have birth defects.
Is Fenbac Xr safe during breastfeeding?
Limited information indicates that orally administered Fenbac Xr appears in low levels in milk and would not be expected to cause any adverse effects in breastfed infants, especially if the infant is older than 2 months.
Can I drink alcohol with Fenbac Xr?
If you, or a loved one, have been prescribed Fenbac Xr for any condition, refrain from alcohol while taking the Fenbac Xr.
Can I drive after taking Fenbac Xr?
Some people may feel drowsy and/or dizzy or have problems with their eyes while they are taking Fenbac Xr tablets. If this happens, you should not drive or do anything that requires you to be alert (such as operate tools or machinery) until these effects have worn off.
How often can I take Fenbac Xr?
It usually is taken 3 times a day at evenly spaced intervals.
What time should I take Fenbac Xr?
Take Fenbac Xr with a snack or just after eating a meal. Try to take your doses at the same times of day each day, as this will help you to remember to take them.
How long does Fenbac Xr take to work?
Most people start to feel the effects within an hour of taking Fenbac Xr.
How long does Fenbac Xr stay in my system?
Since Fenbac Xr is eliminated via urine, it can be detected in a urine screen for up to two days.
How long can I take Fenbac Xr?
The simple answer is as long as it's needed. There's no upper or lower limit on the length of treatment. I generally suggest starting with 12 months of treatment and reviewing from there. Fenbac Xr has been used in patients for over 40 years so we know that it's safe over the long term.
What happens if I miss a dose?
Take the Fenbac Xr as soon as you can, but skip the missed dose if it is almost time for your next dose. Do not take two doses at one time.
What happens if I overdose?
Seek emergency medical attention. Overdose symptoms may include muscle weakness, vomiting, severe dizziness or drowsiness, dilated or pinpoint pupils, shallow breathing, seizure, or loss of consciousness.
Who should not take Fenbac Xr?
Do not use Fenbac Xr at a time when you need muscle tone for safe balance and movement during certain activities. Do not drive or operate heavy machinery until you know how this medicine affects you.
What happen If I stop taking Fenbac Xr?
Do not stop using baclofen suddenly, or you could have unpleasant withdrawal symptoms. Withdrawal from Fenbac Xr can have clinical manifestations that include agitation, insomnia, confusion, delusions, hallucinations, seizures, visual changes, psychosis, dyskinesia, hyperthermia, and increased spasticity.
Can Fenbac Xr affect my kidneys?
Fenbac Xr a commonly prescribed muscle relaxant, is primarily excreted via the kidneys; toxicity is a potentially serious adverse outcome in patients with decreased kidney function.
Can Fenbac Xr affects my liver?
Fenbac Xr is safe to use in patients with liver damage and even cirrhosis because most Fenbac Xr simply passes out in the urine and doesn't rely on liver metabolism.
