The most common side effects with Visudyne (seen in between 1 and 10 patients in 100) are abnormal vision (blurry, hazy, fuzzy vision, flashes of light, decreased vision, grey or dark haloes, and black spots), reactions at the injection site (pain, swelling and inflammation), and infusion-related pain such as back pain, nausea (feeling sick), photosensitivity reactions (sunburn on skin areas exposed to light), asthenia (weakness) and hypercholesteraemia (high blood cholesterol).