Side effects may include:
Abdominal cramps, breast development in males, change in potassium levels (leading to such symptoms as dry mouth, excessive thirst, weak or irregular heartbeat, and muscle pain or cramps), deepening of voice, diarrhea, drowsiness, excessive hairiness, fever, headache, hives, irregular menstruation, kidney problems, lack of coordination, lethargy, liver problems, mental confusion, postmenopausal bleeding, severe allergic reaction, sexual dysfunction, skin eruptions, stomach bleeding, stomach inflammation, ulcers, vomiting

Check with your doctor immediately if any of the following side effects occur:

Incidence not known
Abdominal or stomach cramping, burning, or tenderness
back or leg pains
bleeding gums
blistering, peeling, loosening of skin
bloating
bloody or black, tarry stools
bloody or cloudy urine
blue lips and fingernails
blurred vision
burning, crawling, itching, numbness, prickling, “pins and needles” , or tingling feelings
chest pain
chills
clay-colored stools
clear or bloody discharge from nipple
cloudy urine
confusion
constipation
cough or hoarseness
coughing that sometimes produces a pink frothy sputum
coughing up blood
dark urine
decrease in urine-concentrating ability
decreased appetite
diarrhea
difficult, fast, noisy breathing, sometimes with wheezing
difficulty swallowing
dimpling of breast skin
dizziness, faintness, or lightheadedness when getting up from a lying or sitting position suddenly
dry mouth
fast or irregular heartbeat
fever with or without chills
flushed, dry skin
fruit-like breath odor
general body swelling
general feeling of discomfort or illness
greatly decreased frequency of urination or amount of urine
headache
heartburn
hives or welts
increased blood pressure
increased hunger
increased thirst
increased urination
increased sweating
indigestion
inverted nipple
joint pain, stiffness, or swelling
loss of appetite
lower back or side pain
lump in breast or under the arm
muscle cramps or pain
nausea and vomiting
nosebleeds
numbness, tingling, pain, or weakness in hands, feet, or lips
painful or difficult urination
pains in stomach, side, or abdomen, possibly radiating to the back
pale skin
persistent crusting or scaling of nipple
pinpoint red or purple spots on skin
puffiness or swelling of the eyelids or around the eyes, face, lips, or tongue
red, irritated eyes
redness or swelling of breast
redness, soreness or itching skin
seizures
severe stomach pain
shakiness and unsteady walk
shortness of breath
skin rash
sore on the skin of the breast that does not heal
sore throat
sores, ulcers, or white spots on lips or in mouth
sugar in the urine
swelling in legs and ankles
swelling of face, hands, fingers, feet, or lower legs
swollen or painful glands
thickening of bronchial secretions
tightness in chest
trembling
troubled breathing
unpleasant breath odor
unsteadiness, trembling, or other problems with muscle control or coordination
unusual bleeding or bruising
unusual tiredness or weakness
unusual weight loss
vomiting of blood or material that looks like coffee grounds
weakness and heaviness of legs
weight gain
wheezing
yellow eyes or skin
Get emergency help immediately if any of the following symptoms of overdose occur:

Symptoms of overdose
Difficulty sleeping
disorientation
drowsiness to profound coma
hallucination
lethargy
lightheadedness
mood or other mental changes
rash with flat lesions or small raised lesions on the 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:

Incidence not known
Absent, missed, or irregular menstrual periods
bleeding after menopause
burning feeling in chest or stomach
discoloration of skin
feeling of constant movement of self or surroundings
inability to have or keep an erection
increased sensitivity of skin to sunlight
muscle spasm
restlessness
sensation of spinning
severe sunburn
stomach upset
stopping of menstrual bleeding
swelling of the breasts or breast soreness in both females and males

Check with your doctor immediately if any of the following side effects occur:

Symptoms of too much medicine being absorbed into the bodyVery rare
Dizziness or drowsiness
increased sweating
irregular heartbeat
muscle twitching or trembling
nausea or vomiting
shortness of breath or troubled breathing
unusual excitement, nervousness, or restlessness
unusual tiredness or weakness

Cough; dizziness; headache; nausea; nervousness; sinus inflammation; sore or dry throat; tremor; trouble sleeping; unusual taste in mouth; vomiting.

Seek medical attention right away if any of these SEVERE side effects occur:
Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); chest pain; ear pain; fast or irregular heartbeat; new or worsened trouble breathing; pounding in the chest; severe headache or dizziness; unusual hoarseness; wheezing.

Check with your doctor as soon as possible if any of the following side effects occur:

Rare
Fever
skin rash or itching
sore throat
unusual tiredness and weakness
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
Abdominal pain
diarrhea
dizziness
headache
nausea
vomiting
Rare
Thinning or loss of hair
Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.

Check with your doctor as soon as possible if any of the following side effects occur:

Rare
Fever
skin rash or itching
sore throat
unusual tiredness and weakness
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
Abdominal pain
diarrhea
dizziness
headache
nausea
vomiting
Rare
Thinning or loss of hair
Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.

Dizziness; excitability; headache; nausea; nervousness or anxiety; trouble sleeping; weakness.

Seek medical attention right away if any of these SEVERE side effects occur:
Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); difficulty urinating; fast or irregular heartbeat; hallucinations; seizures; severe dizziness, lightheadedness, or headache; tremor.

Check with your doctor as soon as possible if any of the following side effects occur:

With overuse or long-term use
Increase in eye irritation
Symptoms of too much medicine being absorbed into the body
Dizziness
headache
increased sweating
nausea
nervousness
weakness
Symptoms of overdose
Decrease in body temperature
drowsiness
slow heartbeat
weakness (severe)
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 or rare
Blurred vision
large pupils
Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.

Check with your doctor as soon as possible if any of the following side effects occur:

More common
Eye redness and swelling
Less common
Eye discharge
eye discomfort
eye pain
hives
increased itching of eyes
rash.
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
Headaches
stuffy or runny nose
Less common
Burning or stinging of eyes
dry eyes
eyelid disorder
eye sensitivity to light
fever, tiredness, achiness, and sore throat
increase in size of pupils
sore throat
tearing.

Check with your doctor as soon as possible if any of the following side effects occur:

Less common
Cough (mucus-producing)
headache (severe)
stomach pain and cramping
pain and tenderness around eyes and cheekbones
painful menstrual bleeding
runny or stuffy nose
tightness in chest
troubled breathing
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
Chills
cough
fever
sneezing
sore throat
Less common
Back pain
burning feeling in eye
eyelid swelling
eye dryness
foreign body feeling in eye
general feeling of eye discomfort
increased itching of the eye
redness of the eye
Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.