Effexor can be useful in treating depression and anxiety disorders, but the medication may also cause serious health complications. Although these complications are rare, some have the potential to cause serious harm or even death. Those interested in using Effexor should talk to a doctor about these potential dangers before using the medication.
Blood Pressure Problems
Effexor may cause a dangerous increase in blood pressure, especially for those with a history of high blood pressure or heart problems, according to Effexor XR, the official Effexor website. Symptoms of increasing blood pressure include blurred vision and a severe headache. Individuals experiencing these symptoms should check their blood pressure immediately, and seek immediate emergency medical attention if the blood pressure is too high.
Worsening of Symptoms
Although people take Effexor to positively change their mental state, the medication sometimes has the opposite effect, warns the Effexor website. This is particularly true for adolescents and people younger than 24 years old. Patients taking Effexor should ask their family members and friends to help them monitor their behavior while taking this medication. Individuals who display severe irritability, aggressiveness, restlessness, mania, anxiety or depression while taking this medication may be experiencing this adverse effect, and should consult a doctor or mental health professional as soon as possible. Those who have thoughts of self-harm or suicide need immediate medical attention from a doctor or trained mental health professional.
Serotonin Syndrome
Serotonin syndrome is a rare, but serious, condition that may occur in patients taking Effexor. Symptoms of this condition include nausea, vomiting, diarrhea, rapid or irregular heartbeat, blood pressure changes, hallucinations, confusion, shivering, chills, sweating, shakiness, fever, jumpiness, seizures and coma, according to eMedTV. Patients taking Effexor that show signs of these symptoms need emergency medical attention.
Drug Interactions
Effexor may interact negatively with other medications or supplements, according to Effexor prescribing information. MAOI medications, in particular, may cause serious and even fatal reactions when taking at the same time as Effexor. Those who have recently taken a MAOI medication should not use Effexor within 14 days of discontinuing that medication, and should also wait at least 7 days after discontinuing Effexor before resuming MAOI treatment. All individuals taking any medication or supplement on a regular basis should talk to a doctor or pharmacist about potential interactions before using Effexor.
Allergic Reaction
Although rare, some individuals may experience a severe allergic reaction to Effexor. Difficulty breathing, hives and swelling after taking Effexor are indications that someone may be experiencing an allergic reaction to the medication, according to Drugs.com. People who believe they may be experiencing an allergic reaction should seek medical attention immediately.
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