Hi, I suppose you are having are having some trouble with your ADHD symptoms and thus wishing to get back on Concerta (Methylphenidate). I assume you are currently not on any medication. The effect of concerta on pulse and blood pressure varies from person to person. Some may get to a higher level and some may get into lower level. Its difficult to predict before taking the medicines. But whatever it may cause, affecting your athletic performance because of blood pressure changes is unusually rare. drinking lots of water with minerals and salts would often be sufficient to manage low blood pressure. Even on sexual function its action varies. Some gets more libido and some lessened. Its effect on penis as such is minimal with rare incidents of prolonged and painful erection called as priapism. Medical community is not yet sure of this occurring due to concerta as it is always seen when used with some other drug. Also this side effect is much commoner with Atomoxetine (another ADHD drug) than concerta. If you develop erections lasting longer than 4 hours should seek immediate medical treatment to prevent long-term problems with the penis. Hope this will help you in taking a right decision and sustain activities without getting hampered by ADHD.