Major Side Effects
You should check with your doctor immediately if any of these side effects occur when taking varenicline:
Less common:
Difficult or labored breathing
hyperventilation
tightness in the chest
Incidence not known:
Anger
anxiety
behavior changes
discouragement
feeling sad or empty
feelings of panic
irregular heartbeats
irritability
loss of interest or pleasure
mood swings
restlessness
seeing, hearing, or feeling things that are not there
sleepwalking
thoughts of killing oneself
Minor Side Effects
Some of the side effects that can occur with varenicline may not need medical attention. As your body adjusts to the medicine during treatment these side effects may go away. Your health care professional may also be able to tell you about ways to reduce or prevent some of these side effects. If any of the following side effects continue, are bothersome or if you have any questions about them, check with your health care professional:
More common:
Abnormal dreams
bloated or full feeling
change in taste
difficulty having a bowel movement (stool)
dry mouth
excess air or gas in the stomach or intestines
general feeling of discomfort or illness
headache
lack or loss of strength
loss of taste
nausea
passing gas
stomach pain
trouble sleeping
unusual tiredness or weakness
Less common:
Acid or sour stomach
belching
body aches or pain
chills
cough
decreased appetite
dizziness
ear congestion
fever
heartburn
increased appetite
indigestion
itching skin or rash
loss of appetite
loss of voice
nightmares
sleepiness or unusual drowsiness
sneezing or sore throat
stomach discomfort or upset
stuffy or runny nose
trouble concentrating
unusual drowsiness, dullness, or feeling of sluggishness
vomiting
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Tips on the side effects:
Drink plenty of water throughout the day and take first tablet with dry toast and water and let settle for 5 minutes or so.
If sleep is disrupted, take last tablet earlier in the evening or half the dosage
Get some herbal supplements for the mood swings, tiredness, anxiety and sleep disruption
Embrace these side effects, they will not last forever but if get worse or not improve consult your doctor