Do not take this medicine with any of the following medications:

-thioridazine
This medicine may also interact with the following medications:

-antacids
-antiviral medicines for HIV or AIDS
-certain medicines for fungal infections like ketoconazole and itraconazole
-certain medicines for seizures like carbamazepine, phenobarbital, phenytoin
-certain medicines for stomach problems like cimetidine, famotidine, omeprazole, lansoprazole
-certain medicines that treat or prevent blood clots like warfarin
-rifampin

They need to know if you have any of these conditions:

-eye disease, vision problems
-liver disease
-lung or breathing disease, like asthma
-lung fibrosis
-recent or ongoing radiation therapy
-scarring or thickening of the lungs
-an unusual or allergic reaction to gefitinib, other medicines, foods, dyes, or preservatives
-pregnant or trying to get pregnant
-breast-feeding

Visit your doctor for checks on your progress. You will need to have regular blood tests while on this medicine.
Report any new symptoms promptly. Let your doctor know if you have severe or persistent diarrhea, nausea, loss of appetite, or vomiting, as these side effects may cause dehydration. This drug may cause severe lung problems. Call your doctor if your breathing gets worse and/or you develop a cough or fever.
Do not become pregnant while taking this medicine or for 2 weeks after stopping it. Women should inform their doctor if they wish to become pregnant or think they might be pregnant. Women of child-bearing potential will need to have a negative pregnancy test before starting this medicine. There is a potential for serious side effects to an unborn child. Talk to your health care professional or pharmacist for more information. Do not breast-feed an infant while taking this medicine.

Keep out of the reach of children.
Store at room temperature between 20 and 25 degrees C (68 and 77 degrees F). Throw away any unused medicine after the expiration date.