 [ Symptoms ] could i be pregnant i have been on paragaurd for 3 years i recently change the way i eat with no meat and it is been a month and now my period has not came i am not irregular in my periods i want to kno why it has not came i even had symptoms of being on my period and still no blood [ Disease ] hi been off and found this how does it effect blood pressure viagra can slightly lower blood pressure this is not a problem for most men but viagra is effect on blood pressure is exaggerated if the viagra is taken with a nitrate drug nitrates are one of the treatments doctors prescribe for angina if you take viagra when you are also taking nitrates the combined effect of the viagra and the nitrates can lower your blood pressure to such an extent that it could prove fatal never take viagra at the same time as taking nitrates if i have a heart condition can i take it if you have a heart condition it is important that you discuss this with the doctor before taking viagra viagra may not be appropriate because of the danger of interacting with the nitrates but i think your find if your low blood pressure is a naturally occurring thing then taken viagra would not do you any damage unless you was pushing the doses but have you tried take l arginine 1000mg and zinc to improve your erections see if this helps you good luck