Plenaxis Side Effects
Generic Name: abarelix
Note: This page contains side effects data for the generic drug abarelix. It is possible that some of the dosage forms included below may not apply to the brand name Plenaxis.
It is possible that some side effects of Plenaxis may not have been reported. These can be reported to the FDA here. Always consult a healthcare professional for medical advice.
For the Consumer
Applies to abarelix: powder for suspension, solution
Along with its needed effects, abarelix (the active ingredient contained in Plenaxis) 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 while taking abarelix:Less common
- Fainting or loss of consciousness
- fast or irregular breathing
- skin rash
- swelling of the eyes or eyelids
- tightness in the chest and/or wheezing
- trouble with breathing
Some side effects of abarelix 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
- Back pain
- bladder pain
- breast enlargement
- breast pain
- bloating or swelling of the face, arms, hands, lower legs, or feet
- bloody or cloudy urine
- body aches or pain
- burning while urinating
- decrease in frequency of urination
- decrease in urine volume
- difficult, burning, or painful urination
- difficulty having a bowel movement (stool)
- difficulty in passing urine (dribbling)
- ear congestion
- feeling of warmth
- frequent urge to urinate
- loss of voice
- lower back or side pain
- nasal congestion
- nipple enlargement
- rapid weight gain
- redness of the face, neck, arms, and occasionally, upper chest
- runny nose
- sore throat
- tingling of the hands or feet
- trouble in holding or releasing urine
- trouble with sleeping
- unusual tiredness or weakness
- unusual weight gain or loss
For Healthcare Professionals
Applies to abarelix: intramuscular powder for injection
Endocrine side effects have included hot flushes (79%), sleep disturbance (44%), breast enlargement (30%), and breast pain/nipple tenderness (20%) as pharmacological consequences of androgen deprivation.
General side effects including pain (31%) and fatigue (10%) have been reported.
Musculoskeletal side effects including back pain (17%) have been reported.
Physicians should carefully consider whether the risks of abarelix (the active ingredient contained in Plenaxis) outweigh the benefits in patients with baseline QTc values >450 msec and in patients taking class IA or class III antiarrhythmic medications.
Cardiovascular side effects including peripheral edema (15%) and prolongation of the QT interval have been reported.
Gastrointestinal side effects including constipation (15%), diarrhea (11%), and nausea (10%) have been reported.
Nervous system side effects including dizziness (12%) and headache (12%) have been reported.
Respiratory side effects including upper respiratory tract infection (12%) have been reported.
Genitourinary side effects including dysuria (10%), micturition frequency (10%), urinary retention (10%), and urinary tract infection (10%) have been reported.
Hypersensitivity side effects including immediate-onset allergic reactions (3.7%), sometimes resulting in hypotension and syncope, have been reported to have occurred after administration of abarelix (the active ingredient contained in Plenaxis)
The allergic reaction included urticaria, pruritus, hypotension, and syncope.
Immediate-onset reactions have been reported to have occurred following any administration of abarelix, including the initial dose. The cumulative risk for such a reaction increases with the duration of treatment.
Following each injection of abarelix, patients should be observed for at least 30 minutes in the office. If an allergic reaction associated with hypotension and/or syncope does occur, supportive measures such as leg elevation, oxygen, IV fluids, antihistamines, corticosteroids, and epinephrine should be administered as needed.
Hepatic side effects including clinically meaningful increases in serum transaminases have been reported in a small percentage of patients.
Hematologic side effects including slight decreases in hemoglobin and mean increases in serum triglycerides of approximately 10% have been reported.
More about Plenaxis (abarelix)
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