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Theophylline Unit Converter
Theophylline is a methylxanthine drug used as a bronchodilator for asthma and COPD. It has a narrow therapeutic index, meaning the difference between an effective dose and a toxic dose is small.
Therapeutic Drug Monitoring (TDM) is essential to prevent toxicity (seizures, arrhythmias). This converter facilitates switching between the standard mass units (μg/mL, mg/L) and the international SI molar units (μmol/L).
Mass Units
StandardMicrograms per milliliter (Numerically equivalent to mg/L).
SI / Molar Units
Micromoles per liter (International Standard).
Clinical Context
Therapeutic Range:
• Adults: 10 – 20 μg/mL (55 – 110 μmol/L).
• Neonates: 5 – 15 μg/mL (Apnea of prematurity).
Toxicity:
Levels > 20 μg/mL (> 110 μmol/L) are associated with nausea, vomiting, and tachycardia. Severe toxicity (seizures) often occurs > 30 μg/mL.
Conversion Logic:
Molecular Weight of Theophylline: 180.164 g/mol.
1 μg/mL = 5.55 μmol/L.
1 μmol/L = 0.18 μg/mL.
Clinical References
How to Use This Converter
Follow these steps to normalize Theophylline values.
Enter Values
Input your laboratory result into the corresponding unit field (e.g., μg/mL).
Automatic Conversion
The calculator converts between mass units and the SI molar unit using the molecular weight of 180.16 g/mol.
Reset
Use the Clear button to reset all fields.
Frequently Asked Questions
Yes. 1 microgram per milliliter is numerically identical to 1 milligram per liter.
Peak levels are typically drawn 1-2 hours after immediate-release or 4 hours after sustained-release doses. Trough levels are drawn just before the next dose.