Some of these side effects may occur when taking this medication; they are as follows; Nausea, vomiting, drowsiness, dizziness, loss of appetite, trouble sleeping, weakness, and sweating may occur. However if any of these effects persist or worsen, contact your doctor right away.
If you are experiencing any of these rare but very serious side effects, seek medical help right away. The side effects are as follows; easy bruising/bleeding, shaking (tremor), decrease in sexual interest/ability.
Get medical help right away if you have any very serious side effects, including: fainting, black stools, vomit that looks like coffee grounds, seizures, eye pain/swelling/redness, widened pupils, vision changes (such as seeing rainbows around lights at night, blurred vision).
This medication may increase serotonin and rarely cause a very serious condition called serotonin syndrome/toxicity. The risk increases if you are also taking other drugs that increase serotonin, so tell your doctor or pharmacist of all the drugs you take (see Drug Interactions section). Get medical help right away if you develop some of the following symptoms: fast heartbeat, hallucinations, loss of coordination, severe dizziness, severe nausea/vomiting/diarrhea, twitching muscles, unexplained fever, and unusual restlessness.
Rarely, males may have a painful or prolonged erection lasting 4 or more hours. If this occurs, stop using this drug and get medical help right away, or permanent problems could occur.
A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.