Kamagra 100mg tablets are generally well tolerated, but side effects are always possible. The most common side effects include: headache, dizziness, hot flashes, indigestion, nasal congestion, diarrhea, skin rashes. More serious side effects include unusual heartbeats, urinary tract infections (burning or stinging in the urine, needing to urinate more often), blood in the urine, vision changes such as blurred vision, blue color in vision, or increased awareness of light. , persistent headache or fainting, nosebleeds.