Tadasoft 20 mg is generally intended for adult men with erectile dysfunction, and its active ingredient is tadalafil 20 mg. However, whether it is safe for you depends on your health and other medicines. Since you’ve asked about low blood pressure and other ED medicines, the important points are: 20 mg is a relatively high, on-demand dose of tadalafil. It should not be taken more than once in 24 hours unless specifically directed by a doctor. Tadalafil can lower blood pressure, and the effect can be greater with blood-pressure medicines, alpha-blockers, or substantial amounts of alcohol. D DailyMed +1 Do not take tadalafil with nitrates such as nitroglycerin or isosorbide, because the combination can cause a potentially dangerous drop in blood pressure. D DailyMed Do not combine it with other PDE-5 inhibitors, such as sildenafil (Kamagra, Malegra) or another tadalafil product, unless a doctor specifically tells you to. D DailyMed Common side effects include headache, indigestion, back pain, muscle aches, flushing and nasal congestion. D DailyMed Seek emergency care for an erection lasting more than 4 hours, or sudden loss of vision/hearing. D DailyMed If your BP is already low, particularly around 90/60 mmHg or below, I'd be cautious about taking 20 mg without medical advice. If you give me your usual BP reading, age, and whether you take Kamagra/Malegra, Duratia (dapoxetine), BP medicines, or alcohol, I can tell you specifically whether Tadasoft 20 mg is a reasonable/safe combination for you.