1 The vast majority of people will never have an anaphylactic reaction. 2  The most common causes of anaphylaxis include drugs, such as penicillin, insect stings, foods (peanuts, shellfish), X-ray dye, and latex. 3  The symptoms of anaphylaxis may vary and can include hives, tongue swelling, vomiting, and even shock.
The recommended starting dose for prolonged-release venlafaxine is 75 mg given once daily. Patients not responding to the initial 75 mg/day dose may benefit from dose increases up to a maximum dose of 375 mg/day. Dosage increases can be made at intervals of 2 weeks or more.
Effexor XR contains venlafaxine hydrochloride in strengths of 37.5, 75, or 150 mg tablets. The dose is usually one tablet per day. Serious side effects of Effexor XR include clinical worsening of symptoms and suicide risk, especially in younger patients. Patients may need to be observed for changes in behavior while taking this drug.