No major Semenax side effects are reported. This is an all-natural dietary supplement for improving male sexual health. However, here are a few important safety guidelines to be followed. Firstly, check the correct dosage or the recommended dosage in the product packaging label. Do not increase the dosage at any point in time. You need to be patient to get the results and not try to speed up the results by increasing the dosage. Further to that, if you happen to have any other health conditions, including high blood pressure or heart conditions, or if you are already taking any blood-thinning drugs, then you must first consult your physician before taking this supplement. When you take all these precautions, the supplement is very safe. In case you experience any side effects, immediately stop the dosage and get medical attention. Do not club it with any other ED pills or other male sexual health supplements.