- Theophylline Clearance is Decreased by: -
Cimetidine (but usually not
Ranitidine) - Erythromycin -
Propanolol -
Allopurinol; - Theophylline Clearance is Increased by: -
Dilantin - Phenobarbital
- Side Effects:
Tachycardia,
PVC's, N/V, HA,
Seizures 
