<s>[INST] I am a heart patient. I have gone through a bypass surgery in the year 1996. I take the following drugs daily -1.Creslip  2.Carnisure500 3.Betaone XL50  4.Matilda Forte  5.Clavix 6. Zoryl 1mg (I am Diabetic too). I would like to use Viagra. I am told it is risky for heart patients who use drugs containing nitrate. I would like to know if it is o.k. to use Viagra. Shall be grateful for your advice.My mail ID -  YYYY@YYYY  Regards. [/INST] His can understand your concern for the safety of Viagra in heart patient. No, heart patients should not take Viagra. Viagra (Sildenafil citrate) is known to cause a fall in BP as its one of the side effects. Taken along with Chat Doctor.  Hence, the use of Viagra is contraindicated in patients with heart disease. You may ask your treating doctor to prescribe an alternate but safer medicine for the erectile dysfunction. Hope this answers your query. </s>