Do not stop using codeine suddenly, or you could have unpleasant withdrawal symptoms. At steady state following dosing with 1 mg/day (n=12), maximum paxil plasma concentration averaged 9.2 ng/mL (range, 4.9-13.7 ng/mL) and was reached 1 to 2 hours postdose; AUC(0-24 hr) was 53 ng•hr/mL (range, 20-154 ng•hr/mL). In addition, hypotension and bradycardia were observed. Paxil Cr 375 25 mg, Paxil Cr 375 50 mg, and Paxil Cr 375 100 mg may also contain carnauba wax. Threatened abortion, eclampsia and preeclampsia. In clinical studies in patients with rheumatoid arthritis, PAXIL CR 375 tablets have been shown to be comparable to indomethacin in controlling the signs and symptoms of disease activity and to be associated with a statistically significant reduction of the milder gastrointestinal (see ADVERSE REACTIONS) and CNS side effects. TAKING BROKEN, CHEWED, DISSOLVED, OR CRUSHED MS CONTIN® TABLETS LEADS TO RAPID RELEASE AND ABSORPTION OF A POTENTIALLY FATAL DOSE OF MORPHINE. A third study, also flexible-dose comparing paroxetine (20 mg to 50 mg daily), did not demonstrate statistically significant superiority of PAXIL over placebo on the Hamilton Rating Scale for Anxiety (HAM-A) total score, the primary outcome. In clinical studies, single doses of finasteride up to 400 mg and multiple doses of finasteride up to 80 mg/day for three months did not result in adverse reactions. The antihypertensive effects of Paxil were evaluated in two randomized, double-blind clinical studies. Oral plasma clearance of topiramate appears to be reduced when administered with metformin. Co-administration of fosamprenavir/ritonavir with paxil cr 375 significantly decreased plasma levels of paxil cr 375. Food does not appear to affect the systemic bioavailability of fluoxetine, although it may delay its absorption by 1 to 2 hours, which is probably not clinically significant. Common side effects of PAXIL CR 375 and PAXIL CR 375 XR include diarrhea, nausea, and upset stomach.