drugs that interact with sildenafil:

I found this list here, and I thought I'd put the list down for easy reference, should the need arise.

List of drugs that may cause excessive decrease in blood pressure
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Nitrates:

Generic Name	BRAND NAME
Isosorbide dinitrate	DILATRATE-SR, ISORDIL, SORBITRATE
Isosorbide mononitrate	IMDUR, ISMO, MONOKET
Nitroglycerin	MINITRAN, NITRO-BID, NITRO-DUR, NITROSTAT, TRANSDERM-NITRO
Alpha Blockers
Generic Name	BRAND NAME
Doxazosin**	CARDURA**
Prazosin*	MINIPRESS*
Terazosin*	HYTRIN*
Tamsulosin**	FLOMAX**
Alfuzosin***	UROXATRAL***

Drugs that may cause sildenafil toxicity:

Generic Name	BRAND NAME
Amprenavir	AGENERASE
Aprepitant	EMEND
Atazanavir	REYATAZ
Clarithromycin**	BIAXIN**
Conivaptan	VAPRISOL
Cyclosporine	NEORAL, SANDIMMUNE
Darunavir	PREZISTA
Dasatinib	SPRYCEL
Delavirdine	RESCRIPTOR
Diltiazem**	CARDIZEM, CARDIZEM CD, DILACOR XR, TIAZAC**
Erythromycin	EES, ERYTHROCIN
Fluconazole	DIFLUCAN
Fluvoxamine**	LUVOX**
Fosamprenavir	LEXIVA
Grapefruit Juice
Imatinib	GLEEVEC
Indinavir	CRIXIVAN
Itraconazole*	SPORANOX*
Ketoconazole	NIZORAL
Lapatinib	TYKERB
Mifeprestone	MIFEPREX
Nefazodone*	SERZONE*
Nelfinavir	VIRACEPT
Posaconazole	NOXAFIL
Quinupristin	SYNERCID
Ritonavir	NORVIR
Saquinavir	FORTOVASE, INVIRASE
Telithromycin*	KETEK*
Troleandomycin	TAO
Verapamil	CALAN, CALAN SR, COVERA-HS, ISOPTIN, ISOPTIN SR, VERELAN
Voriconazole	VFEND
Zafirlukast*	ACCOLATE*