The following side effects may get better over time as your body gets used to the medication. Let your healthcare provider know immediately if you continue to experience these symptoms or if they worsen over time.
Common Side Effects
- Dizziness
- Headache
- Drowsiness
- Sleep problems (too tired or trouble sleeping)
- Tiredness
- Weakness
- Shakiness (tremors)
- Twitching
- Overactive reflexes
- Constipation
- Stomach upset
- Dry mouth
- Weight gain
- Low blood pressure when you stand up
- Swelling
- Sexual health problems (e.g., erectile dysfunction, problems with orgasms)
Less Common Side Effects
- Blurry vision
- Eye movements that you can't control
- Itchiness
- Sweating
- Feeling jittery
- Numbness or tingling
- Repeating your words
- Bladder problems
Phenelzine serious side effects
Contact your healthcare provider immediately if you experience any of the following.
- Suicidal thoughts or behaviors
- Extremely high blood pressure: seizure, chest pain, severe headache, frequent headaches, confusion, blurry vision, anxiety, trouble breathing
- Serotonin syndrome: hallucinations, seizure, confusion, restlessness, shivering, sweating, high fever, headache, racing heart, muscle stiffness or twitching, tremor
Source: DailyMed
The following Phenelzine side effects have also been reported
Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your doctor immediately if any of the following side effects occur:
More common
Chills
cold sweats
confusion
dizziness, faintness, or lightheadedness when getting up from a lying or sitting position
overactive reflexes
shakiness in the legs, arms, hands, or feet
sudden jerky movements of the body
swelling
trembling or shaking of the hands or feet
Less common
Abdominal or stomach pain
actions that are out of control
burning, crawling, itching, numbness, prickling, "pins and needles", or tingling feelings
change in consciousness
clay-colored stools
dark urine
decrease in frequency of urination
decrease in urine volume
difficult or troubled breathing
difficulty in passing urine (dribbling)
disorganized thoughts
dizziness
drowsiness
false or unusual sense of well-being
fast, pounding, or irregular heartbeat or pulse
fear or nervousness
general feeling of discomfort, illness, or weakness
headache
increased sweating
irregular, fast or slow, or shallow breathing
irritability
lack of emotion or feelings
loss of appetite
loss of consciousness
loud or fast speech
muscle tremors
muscle twitching
nausea or vomiting
nervousness
no emotion or expression in speech
pale or blue lips, fingernails, or skin
rapid, deep, or shallow breathing
rash
restlessness
seeing or hearing things that are not there
seizures
shakiness and unsteady walk
shortness of breath
slow or irregular heartbeat
stomach cramps
sweating
swelling of the feet or lower legs
talking, feeling, and acting with excitement
uncontrolled eye movements
unpleasant breath odor
unsteadiness, trembling, or other problems with muscle control or coordination
unusual paleness
unusual tiredness or weakness
vomiting of blood
weakness
yellow eyes or skin
Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:
More common
decreased interest in sexual intercourse
inability to have or keep an erection
indigestion
loss in sexual ability, desire, drive, or performance
loss of appetite
not able to have an orgasm
passing of gas
stomach pain, fullness, or discomfort
trouble sleeping
unable to sleep
unusually deep sleep
unusually long duration of sleep
Less common
Blindness
blurred vision
decreased vision
redness, swelling, or soreness of the tongue
tearing
Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.
Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.
