What you’ve described sounds like an intravenous (IV) infusion solution containing theophylline at 0.16% in 5% dextrose (D5W) in a plastic IV bag. Here’s what that means and some key points:
- Theophylline concentration: 0.16% w/v = 1.6 mg/mL.
- Dextrose 5%: the 5% dextrose serves as the IV diluent.
- Example: in a 1000 mL bag, total theophylline = 1.6 mg/mL × 1000 mL = 1,600 mg (1.6 g) theophylline.
Important context about theophylline IV solutions
- Theophylline is a drug with a narrow therapeutic window. Blood levels must be monitored to avoid toxicity.
- IV theophylline (often given as theophylline or as aminophylline equivalent) is usually used in a hospital setting with careful dose adjustments and frequent serum level checks. It’s less commonly used nowadays because safer, more effective options exist for asthma/COPD.
General dosing guidance (only as a rough reference; dosing must be individualized by a clinician)
- Loading/initial dose: often around 5 mg/kg (theophylline equivalent) given over 20–30 minutes.
- Maintenance infusion: roughly 0.4–0.7 mg/kg/hour, adjusted to achieve a trough serum theophylline level in the commonly targeted range (often about 10–20 mcg/mL, though ranges may vary by protocol).
- Monitor: serum theophylline levels after starting therapy or after dose changes (usually within 6–12 hours), plus watch for signs of toxicity.
Safety and interactions
- Potential side effects: nausea, vomiting, tremor, nervousness, tachycardia, palpitations; at higher levels: seizures, arrhythmias.
- Interactions that can raise theophylline levels: certain antibiotics (e.g., erythromycin, ciprofloxacin), cimetidine, some antifungals; flu vaccines, etc.
- Factors that lower clearance: smoking, liver disease, certain age groups; dose adjustments are often needed.
- Do not adjust the dose yourself; this should be managed by a clinician with monitoring.
Storage and handling
- IV solutions should be used as directed by the pharmacy label and healthcare provider. Do not use if the bag is damaged or the solution looks unusual.
- Compatibility: theophylline/D5W is generally used as an IV fluid, but always check compatibility with other IV meds being given through the same line.
If you’re asking about a specific product, a prescription, or you need dosing for a particular patient, please share more context (e.g., patient age, weight, current meds, target therapeutic level), or consult the prescribing clinician or a pharmacist. If you have a label and want help interpreting it, I can walk through what each part means.