What does XR or ER mean after a drug name?

Venlafaxine withdrawal symptoms typically last up to 3 to 4 weeks, but may persist even longer. You should avoid abruptly stopping venlafaxine treatment unless otherwise directed by your healthcare provider. Gradually reducing the dose over 4 weeks can help to prevent severe withdrawal symptoms in most people. Continue reading

Serotonin syndrome is a potentially life-threatening condition caused by an excess of serotonin in the body, usually triggered by medications or drugs that increase serotonin activity. It most commonly occurs when certain antidepressants, migraine medications, opioids, or illicit drugs are taken alone in high doses or, more often, in combination. Common drug classes that can cause serotonin syndrome include selective serotonin reuptake inhibitors (SSRIs), monoamine oxidase inhibitors (MAOIs), and opioids like tramadol.

In the US, Farmapram is called alprazolam (brand name: Xanax). Farmapram appears to be a common name for alprazolam in Mexico and may be manufactured in that country. It can be dangerous to purchase alprazolam on the Internet or outside the U.S. It may be against the law to bring these products into the US from a foreign country.