You could depend on buy tadalafil 100mg being effective for around 36 hours, although this period may be slightly various for various individuals relying on their wellness problem and other drugs they are taking which might affect its performance. Tadalafil overdose symptoms include nausea, uneven heart beat, fainting, chest and lightheadedness pain. Tadalafil is preferred due to the fact that of a few mild negative side effects it in some cases induces (muscle pain, flushing, looseness of the bowels, cough, discomfort in the belly, heartburn ( pyrosis ), headache, and acid indigestion) and longest duration of efficiency - 36 hrs.