Drug Interaction Report

Using porfimer together with methoxsalen may increase the risk of a photosensitivity reaction (e.G., redness, swelling, itching, burning sensation, feeling hot, and/or blisters), following exposure to sunlight or bright indoor lights such as examination, dental or operating room lamps; floodlights; halogen lights; and unshaded light bulbs at close proximity. It is recommended that methoxsalen be avoided for at least 30 days following therapy with porfimer, and until a test for residual photosensitivity shows no photosensitivity reaction within 24 hours. In some cases, it might be necessary to avoid photosensitizing medications for 90 days or longer, although it may not be feasible to interrupt some treatments for that long, especially if they are medically necessary. Exposing your skin to normal indoor lighting is helpful as it will help your body get rid of porfimer more quickly, so you do not need to stay inside in the dark. Check with your doctor to see if you should temporarily withhold any of your medications after taking porfimer or if you have any other questions. It is important to tell your doctor about all other medications you use, including vitamins and herbs. Do not stop using any medications without first talking to your doctor.

Methoxsalen should be administered with food or milk. This may make it easier for your body to tolerate the medication. Avoid eating or coming in contact with limes, figs, parsley, parsnips, rue (Ruta graveolens), mustard, carrots and celery. This can increase the risk of photosensitivity and cause your skin to burn more easily. Avoid prolonged exposure to sunlight, sunlamps, or tanning beds. Methoxsalen make your skin more sensitive to sunlight, and a sunburn may result. Wear protective clothing and use a sunscreen if you must be in the sun. Call your doctor if you have severe burning, redness, itching, rash, or swelling after being in the sun.

The recommended maximum number of medicines in the 'photochemotherapeutic agents' category to be taken concurrently is usually one. Your list includes two medicines belonging to the 'photochemotherapeutic agents' category:

• methoxsalen
• porfimer

Note: In certain circumstances, the benefits of taking this combination of drugs may outweigh any risks. Always consult your healthcare provider before making changes to your medications or dosage.