Dont ever take an herbal supplement for sex if you have high blood pressure, no matter what, I promise you you could easily get a stroke. You might want to ask your Doctor to lower your meds or maybe you also take an antidepressant which also cause sex problems, don't ever do anything without talking to your practicing physician.
Hello.
I can't second guess your physician; however, I'd be very careful with Viagra and high blood pressure. There are no herbal supplements that are effective. None have been certified as such by the FDA.
As to why you're sometimes having erections and sometimes not: blood pressure highly affects blood flow to your penis, and that's what creates an erection. So if there's any medical condition that inhibits blood flow, this will affect your erection.
However, you also may be sabotaging your pleasure due to worry and anxiety about this.
Our society does a terrible disservice to men by raising them to think that their penis has to be 10 inches long, hard as a rock and last all night. It’s no wonder that many men feel insecure about their sexuality. Great sex involves your whole body; in fact, having great, mutually satisfying sex is usually quite the opposite of what you see in those performance-oriented sex videos.
The more you think of sex as being about performance, the more worries you'll have. If you're stressed, you'll probably worry even more. And this can be a vicious circle. For most of us, sex is about fun and pleasure. If you think of it as performance, or a “job,” you’ll set yourself for a stressful experience. Remember: Performance can be the enemy of pleasure and fun.
Men receive so many messages that sex is about “performance” and pleasing a partner, rather than just enjoying the pleasure of it. Everything is goal-oriented—like a football game. The other message that many men receive is that sex is somehow dirty and wrong, unless you’re doing it for reproductive purposes. Sometimes this can creep into our unconscious thoughts and sabotage any pleasure.
So you may have created a self-fulfilling prophesy by worrying so much that now your penis sometimes becomes downright rebellious. If you relax and stop worrying and allow yourself to enjoy pleasure without the goal of erection, you'll find yourself having much more fun. Best of luck to you. Dr. J