Dear service user, Thanks for writing. I understand your concern of erectile dysfunction most probably secondary to Congestive Heart Failure. Viagra (Sildenafil) is not the only option. Sildenafil can cause significant adverse effect to patients who are on medication used for CHF. It may fall the blood pressure and may cause falls, headache, dizziness and syncope. There are number of other treatment options. These are as follows 1. Injected, implanted, or topically applied medications 2. External vacuum and constriction devices 3. Surgery (the last resort, when all fail to help you.) Kindly consult urosurgeon for this. He can better explain you pros and cons of all these treatment modalities, their success rates and of course cost of each one. Wish you good health. Regards