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Nausea, vomiting, lack of appetite, diarrhea, drowsiness, dizziness, trouble sleeping, dry mouth, muscle/joint pain, fatigue, or yawning may occur. If any of these effects persist or worsen, notify your doctor or pharmacist promptly.
Remember that your doctor has prescribed this medication because the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.
Tell your doctor immediately if any of these serious side effects occur: changes in sexual ability/desire, increased sweating, persistent nausea/vomiting, uncontrolled movements (tremor), unusual or severe mental/mood changes, weight changes.
Tell your doctor immediately if any of these unlikely but serious side effects occur: black stools, change in frequency of menstrual periods, "coffee-ground" vomit, confusion, easy bruising/bleeding, fast heartbeats, seizures, vision problems.
For males, in the very unlikely event you have a painful or prolonged erection lasting 4 or more hours, stop using this drug and seek immediate medical attention, or permanent problems could occur.
A serious allergic reaction to this drug is unlikely, but seek immediate medical attention if it occurs. Symptoms of a serious allergic reaction include: rash, itching, swelling, severe dizziness, trouble breathing.
Common side effects:
Inability to have an Erection Severe
Sexual Problems Severe
Altered Interest in Having Sexual Intercourse Severe
Problem with Ejaculation Severe
Dry Mouth Less Severe
Drowsiness Less Severe
Abnormal Trouble Sleeping Less Severe
Feel Like Throwing Up Less Severe
Infrequent side effects:
Feeling Restless Severe
Blurred Vision Severe
Problem with Periods Severe
Itching Severe
Loss of Memory Severe
Fever Severe
Rash Severe
Trouble Breathing Severe
Excess Urination Severe
Confused Severe
Grinding of the Teeth Less Severe
Blood Pressure Drop Upon Standing Less Severe
Inflammation of the Nose Less Severe
Sinus Irritation and Congestion Less Severe
Increased Production of Saliva Less Severe
Indigestion Less Severe
Joint Pain Less Severe
Muscle Pain Less Severe
Low Energy Less Severe
Excessive Sweating Less Severe
Involuntary Quivering Less Severe
Taste Problems Less Severe
Loss of Appetite Less Severe
Weight Gain Less Severe
Weight Loss Less Severe
Yawning Less Severe
Throwing Up Less Severe
Gas Less Severe
Diarrhea Less Severe
Stomach Cramps Less Severe
Numbness and Tingling Less Severe
Feeling Weak Less Severe
Anxious Less Severe
Rare side effects:
Extreme Sense of Well Being Severe
Aggressive Behavior Severe
Myoclonus Severe
Paroxysmal Choreoathetosis Severe
Extrapyramidal Reaction Severe
Neuroleptic Malignant Syndrome Severe
Serotonin Syndrome - Adverse Drug Interaction Severe
Very Rapid Heartbeat - Torsades de Pointes Severe
Prolonged Q-T Interval on EKG Severe
Abnormal Heart Rhythm Severe
Blood Clot Severe
Hemorrhage Severe
Hemorrhage of Blood Under the Skin Severe
Liver Tissue Death Severe
Acute Inflammation of the Pancreas Severe
Bleeding of the Stomach or Intestines Severe
Kidney Failure Severe
Continued Painful Erection Severe
Discharge of Milk in Men or Women when Not Breastfeeding Severe
Breast Tenderness Severe
Breast Fullness due to Milk Production Severe
Abortion Severe
Erythema Multiforme Severe
Toxic Epidermal Necrolysis Severe
Serious Muscle Tissue Damage Severe
Hallucination Severe
Seizures Severe
A Feeling of Restlessness with Inability to Sit Still Severe
Voluntary Movement Difficulty Severe
Difficult or Painful Urination Severe
Life Threatening Allergic Reaction Severe
Giant Hives Severe
Reaction due to an Allergy Severe
Low Amount of Sodium in the Blood Severe
Hemolytic Anemia Severe
Decrease in the Blood-Clotting Protein Prothrombin Severe
Decreased Blood Platelets Severe
Manic-Depression Severe
Mood Changes Severe
Delusions Severe
Paranoia Severe
Mental Disorder with Loss of Normal Personality & Reality Severe
Panic Disorder Severe
Loss of One's Own Sense of Reality or Identity Severe
Change in Mental State Severe
Having Thoughts of Suicide Severe
Involuntary Eye Movement Less Severe
Increased Levels of Prolactin in the Blood Less Severe
If you notice other effects not listed above, contact your doctor or pharmacist.
Source(s):
webmd.com