Cenforce LD you mean a Cenforce product containing sildenafil, side effects occur mainly because sildenafil doesn't act only on the blood vessels in the penis. It also causes some systemic blood-vessel relaxation, which can affect other parts of the body. Sildenafil is associated with headache, flushing, indigestion, nasal congestion, dizziness, and visual changes. D DailyMed +1 For example: Headache/flushing: blood vessels elsewhere in the body also dilate. Nasal congestion: blood-vessel dilation in the nasal passages can cause Cenforce LD . Dizziness: blood pressure can fall, particularly with certain other medicines. Indigestion: sildenafil can affect vascular and gastrointestinal function. Visual changes: sildenafil also affects PDE-6 enzymes involved in retinal signaling. D DailyMed The likelihood of side effects can increase with higher doses or certain drug combinations. Sildenafil should not be combined with nitrate medicines such as nitroglycerin because of the risk of a dangerous blood-pressure drop. D dailymed-beta.nlm.nih.gov If you tell me the exact ingredients and strength printed on your Cenforce LD package, I can explain which ingredient is responsible for each potential side effect.