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
Blurred vision
chest pain or discomfort
confusion
dizziness, faintness, or lightheadedness when getting up suddenly from a lying or sitting position
slow or irregular heartbeat
sweating
unusual tiredness or weakness
Less common
Bloating or swelling of the face, arms, hands, lower legs, or feet
cough
decreased urine output
difficult or labored breathing
difficulty with speaking
dilated neck veins
disturbed color perception
double vision
extreme tiredness or weakness
fast, pounding, or racing heartbeat or pulse
halos around lights
headache
inability to move the arms, legs, or facial muscles
inability to speak
irregular breathing
loss of vision
night blindness
noisy breathing
overbright appearance of lights
pain, tension, and weakness upon walking that subsides during periods of rest
paleness or cold feeling in the fingertips and toes
rapid weight gain
seeing, hearing, or feeling things that are not there
short-term memory loss
slow speech
swelling of the face, fingers, feet, or lower legs
tightness in the chest
tingling of the hands or feet
tingling or pain in the fingers or toes when exposed to cold temperatures
troubled breathing
tunnel vision
unusual weight gain or loss
Rare
Bluish color of the skin of the fingers or toes
chills
clay-colored stools
continuing loss of appetite
continuing or severe abdominal or stomach pain
continuing or severe nausea and vomiting
dark urine
difficulty with moving
fever
general tiredness and weakness
hoarseness
increased frequency of urination
itching skin
light-colored stools
lower back or side pain
muscle pain or stiffness
numbness of the fingers or toes
pain, swelling, or redness in the joints
rash
sore throat
sores, ulcers, or white spots on the lips or in the mouth
unpleasant breath odor
unusual bleeding or bruising
upper right abdominal or stomach pain
vomiting of blood
weakness
yellow eyes and skin
Incidence not known
Black, tarry stools
bleeding gums
blood in the urine or stools
burning, crawling, itching, numbness, prickling, "pins and needles", or tingling feelings
cool, sweaty skin
pinpoint red spots on the skin
Get emergency help immediately if any of the following symptoms of overdose occur:
Symptoms of overdose
Bluish color of the fingernails, lips, skin, palms, or nail beds
change in consciousness
loss of consciousness
no blood pressure or pulse
stopping of the heart
very drowsy or sleepy
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:
Less common
Belching
bloated feeling
decreased interest in sexual intercourse
difficulty having a bowel movement
discouragement
dry mouth
excess air or gas in stomach or bowels
feeling of constant movement of self or surroundings
feeling of fullness
feeling of indigestion
feeling sad or empty
inability to have or keep an erection
irritability
loss in sexual ability, desire, drive, or performance
loss of interest or pleasure
nightmares
pain in the chest below the breastbone
passing gas
redness or other discoloration of the skin
runny nose
sensation of spinning
sneezing
stuffy nose
tiredness
trouble concentrating
trouble sleeping
Rare
Bone pain
continuing ringing or buzzing or other unexplained noise in the ears
dry eyes
hair loss or thinning of the hair
hearing loss
increased sensitivity of the skin to sunlight
pain in the penis on erection
severe sunburn
Incidence not known
Change in taste or bad, unusual, or unpleasant (after) taste
fear or nervousness
hives or welts
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.
 Lopressor side effects (more detail)
