Cetirizine; Pseudoephedrine: (Major) Avoid administration of pseudoephedrine products to patients who have recently undergone, or will soon undergo, a procedure or treatment that requires general anesthesia. Routine complete blood cell (CBC) counts should be performed throughout therapy. The relapse intervals tend to lengthen as the toxic anticholinergic agent is metabolized, so the patient should be carefully observed for 8 to 12 hours following the last relapse generisk viagra billigt. See the end of this Medication Guide for a complete list of ingredients in AVONEX.