If Silditop 100 contains sildenafil 100 mg, you can find reliable information about its side effects in the official sildenafil patient information. M MedlinePlus Common side effects Headache Flushing Indigestion/heartburn Nausea or diarrhea Stuffy nose Muscle or back pain Changes in color vision or increased sensitivity to light M MedlinePlus Seek urgent medical attention if you develop An erection Silditop 100 more than 4 hours Sudden loss or major change in vision Sudden hearing loss or ringing in the ears Fainting or severe dizziness Chest pain or significant breathing difficulty Severe allergic reaction (swelling, hives, difficulty breathing) M MedlinePlus 100 mg is the usual maximum recommended sildenafil dose for ED, and it should generally not be taken more than once in 24 hours. If you tell me what side effect you're concerned about, I can explain how serious it is and what to do.