Asmaloc SR Tablet (sustained Release)
Asmaloc SR is a bronchodilator, structurally classified as a Methylxanthine. Asmaloc SR has two distinct actions in the airways of patients with reversible obstruction; smooth muscle relaxation and suppression of the response of the airways to stimuli. Asmaloc SR also increases the force of contraction of diaphragmatic muscles. The half-life of Asmaloc SR is influenced by a number of known variables. In adult nonsmokers with uncomplicated asthma the half-life ranges from 3 to 9 hours
This is used for the symptomatic treatment of reversible bronchoconstriction associated with bronchial asthma, chronic obstructive pulmonary emphysema, chronic bronchitis and related bronchospastic disorders.
Asmaloc SR is also used to associated treatment for these conditions: Asthma, Bronchitis, Bronchoconstriction, Bronchospasm, Chronic Obstructive Pulmonary Disease (COPD), Chronic bronchial inflammation, Airway secretion clearance therapy, Bronchodilation
|Trade Name||Asmaloc SR|
|Other Names||Teofilina, Theophyllin|
|Type||Tablet (sustained Release)|
40%, primarily to albumin.
|Therapeutic Class||Theophylline & related drugs|
|Manufacturer||Sharif Pharmaceuticals Ltd|
|Last Updated:||June 23, 2021 at 11:25 am|
Table Of contents
Asmaloc SR dosage
Dosages are adjusted to maintain serum theophylline concentrations that provide optimal relief of symptoms with minimal side effects. Most of the controlled release preparations may be administered every 12 hours in adults while administration every 8 hours may be necessary in some children with markedly rapid hepatic metabolism of theophylline. The recommended dosages for achieving serum theophylline concentrations within the accepted therapeutic range is as follow:
- 1-6 months: 10 mg/Kg/day
- 6 months-1 year: 15 mg/Kg/day
- 1-9 years: 24 mg/Kg/day
- 10-16 years: 18 mg/Kg/day
- Adults: 10-15 mg/Kg/day
The following side effects have been observed:
Gastrointestinal: Nausea, vomiting, epigastric pain and diarrhoea.
Central nervous system: Headache, irritability, restlessness, insomnia, muscles twitching.
Cardiovascular: Palpitation, tachycardia, hypotension. circulatory failure.
Respiratory: Tachypnoea.Renal: Potentiation of diuresis.
Others: Alopecia, hyperglycemia, rash etc.
Careful consideration is needed for various interacting drugs and physiologic conditions that can alter Asmaloc SR clearance. Dosage adjustment is required prior to initiation of Asmaloc SR therapy, prior to increases in Asmaloc SR dose, and during follow up. The dose of Asmaloc SR selected for initiation of therapy should be low and, if tolerated, increased slowly over a period of time.
Allopurinol, cimetidine, norfloxacin, ciprofloxacin, erythromycin, oral contraceptives and propranolol increase serum theophylline levels. Phenytoin, methotrexate and rifampicin lead to decreased serum theophylline levels
- Avoid excessive or chronic alcohol consumption. Ingesting alcohol may reduce the clearance, and therefore increase the serum concentrations of theophylline.
- Avoid St. John's Wort.
- Take with or without food. Take consistently with regard to food.
Volume of Distribution
- 0.3 to 0.7 L/kg
- 0.29 mL/kg/min [Premature neonates, postnatal age 3-15 days]
- 0.64 mL/kg/min [Premature neonates, postnatal age 25-57 days]
- 1.7 mL/kg/min [Children 1-4 years]
- 1.6 mL/kg/min [Children 4-12 years]
- 0.9 mL/kg/min [Children 13-15 years]
- 1.4 mL/kg/min [Children 16-17 years]
- 0.65 mL/kg/min [Adults (16-60 years), otherwise healthy non-smoking asthmatics]
- 0.41 mL/kg/min [Elderly (>60 years), non-smokers with normal cardiac, liver, and renal function]
- 0.33 mL/kg/min [Acute pulmonary edema]
- 0.54 mL/kg/min [COPD >60 years, stable, non-smoker >1 year]
- 0.48 mL/kg/min [COPD with cor pulmonale]
- 1.25 mL/kg/min [Cystic fibrosis (14-28 years)]
- 0.31 mL/kg/min [Liver disease cirrhosis]
- 0.35 mL/kg/min [acute hepatitis]
- 0.65 mL/kg/min [cholestasis]
- 0.47 mL/kg/min [Sepsis with multi-organ failure]
- 0.38 mL/kg/min [hypothyroid]
- 0.8 mL/kg/min [hyperthyroid]
Pregnancy & Breastfeeding use
Pregnancy: It is not known whether Asmaloc SR can cause foetal harm when administered to pregnant woman.Xanthines should be given to a pregnant woman only if clearly needed.
Nursing mother: Asmaloc SR is excreted into breast milk and may cause irritability or other signs of mild toxicity in nursing human infants. Serious adverse effects in the infant are unlikely unless the mother has toxic serum Asmaloc SR concentrations.
Hypersensitivity to xanthine derivatives. It is also contraindicated in patients with active peptic ulcer disease and in individuals with underlying seizure disorders (unless receiving appropriate anti-convulsing medication).
Asmaloc SR should not be administered concurrently with other xanthine. Use with caution in patients with hypoxemia, hypertension, or those with history of peptic ulcer. Do not attempt to maintain any dose that is not tolerated.
Symptoms may include nausea, vomiting, gastrointestinal irritation, cramps, convulsions, tachycardia & hypotension. The stomach contents should be emptied & supportive measures employed to maintain circulation, respiration & fluid & electrolyte balance. Electrocardiographic monitoring should be carried out & in severe poisoning charcoal haemoperfusion should be used.
Store in a cool and dry place, protect from light and moisture. Keep out of the reach of children