Type your drug name (like Atorvastatin, Sildenafil, etc)
Prescription Settings
0.5ml of 15mcg/0.5ml
1 vial
0.5ml of 15mcg/0.5ml
1 vial

Infergen Side Effects

Common and Rare Side Effects

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


black, tarry stools

blood in the urine or stools

body aches or pain

burning, crawling, itching, numbness, prickling, "pins and needles", or tingling feelings

chest pain



cough or hoarseness







difficult or labored breathing

dryness or soreness of the throat



feeling unusually cold

fever or chills

general feeling of discomfort or illness


increased sweating

joint pain

loss of appetite

lower back or side pain

mental depression

muscle aches and pains



painful or difficult urination


pinpoint red spots on the skin

quick to react or overreact emotionally

rapidly changing moods

redness at the place of injection

runny nose


shortness of breath

sore throat


tender, swollen glands in the neck

tightness in the chest

trouble with sleeping

trouble with swallowing

trouble with thinking or concentrating

unusual bleeding or bruising

unusual tiredness or weakness

voice changes


Less common

Irregular heartbeat


Blurred vision or loss of vision

skin rash, hives, or itching

Incidence not known

Abdominal or stomach pain

bleeding gums

bloody or black, tarry stools

change in walking and balance

clay-colored stools

clumsiness or unsteadiness



coughing up blood

dark-colored urine

decreased urination

difficulty with breathing or swallowing


dry mouth


fast heartbeat

full or bloated feeling

increase in heart rate

increased menstrual flow or vaginal bleeding


loss of consciousness

muscle cramps or spasms



pressure in the stomach

prolonged bleeding from cuts

rapid, shallow breathing

red or black, tarry stools

red or dark brown urine


severe stomach pain

shakiness and unsteady walk

shakiness in the legs, arms, hands, or feet

sunken eyes

swelling of the abdominal or stomach area


trembling or shaking of the hands or feet

unpleasant breath odor

unsteadiness, trembling, or other problems with muscle control or coordination

vomiting of blood or material that looks like coffee grounds

wrinkled skin

yellow eyes or 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:

More common

Acid or sour stomach

aching muscles

back pain


decreased appetite

difficulty with moving

feeling of warmth

general feeling of discomfort or illness

hair loss

heartburn or indigestion

lack or loss of strength

loss of memory

muscle pain or stiffness

pain in the back or joints

pain in the limbs, muscles, or neck

pain or tenderness around the eyes and cheekbones

problems with memory

redness of the face, neck, arms, and occasionally, upper chest


stomach discomfort, upset, or pain

stuffy nose

sudden sweating

swollen joints

thinning of the hair

unable to sleep

weight loss

Incidence not known

Being forgetful

bleeding, blistering, burning, coldness, discoloration of the skin, feeling of pressure, hives, infection, inflammation, itching, lumps, numbness, pain, rash, redness, scarring, soreness, stinging, swelling, tenderness, tingling, ulceration, or warmth at the injection site

blistering, peeling, or loosening of the skin

bone pain

burning feeling in the chest or stomach

change in vision

difficulty with moving

difficulty with speaking

false beliefs that cannot be changed by facts

hearing loss

pain, swelling, or redness in the joints

red, irritated eyes

red skin lesions, often with a purple center

seeing, hearing, or feeling things that are not there

sores, ulcers, or white spots in the mouth or on the lips

Interferon alfacon-1 may cause a temporary loss of some hair. After treatment has ended, normal hair growth should return.

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.

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