Hypoactive sexual desire disorder or HSDD is a condition in which a person has low or no sexual desire and fantasies. This is considered a condition if the person affected is distressed by this. This condition is hard to diagnose, as usually the causes are emotional and psychological. Therapy is needed in order to find out when and how the condition has started and then work with both partners over the issues that might have triggered HSDD. Viagra has been proved to be of help in women who have Female Sexual Arousal Disorder, also known as frigidity, meaning that they are not able to become aroused when stimulated. Sildenafil citrate, the active ingredient of Viagra, works on men by facilitating blood flow to the penis and thus causing and maintaining erection. It has been observed in clinical trials that it has a similar effect on women, causing blood to flood the genitals and cause arousal. As far as HSDD goes, tests on women were not as successful. Nevertheless, men who have taken sildenafil citrate report a stronger sexual desire and improved libido. It might be that by giving them back the confidence in their masculinity, it has eliminated their anxiety to perform or other psychological obstacles that were causing HSDD. Sildenafil citrate needs to be taken ideally one hour before sexual intercourse. Its effects actually kick in only when the person who has taken it becomes aroused. Its effect lasts for about four hours. Some men have claimed that they could maintain an erection even after having an orgasm, while other say the effect faded after orgasm. Viagra is until now the best-known treatment for erectile dysfunction. It actually became the word for solving sexual problems. Generic Viagra can be purchased online at a fraction of the price in pharmacies and in complete discretion.