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