Phototoxic effects are particularly pronounced if one is taking certain antibiotics such as sulfonamides, quinolones (cipro, floxin etc.), doxycycline, demeclocycline, birth control pills, non-steroidal anti-inflammatory drugs and many more.Prolonged sun exposure is dangerous. Sun accounts for over 90% of all skin cancers. Tan and sun burn are signs of injury to the skin. Prolonged sun exposure can lead to premature aging, pre-cancerous conditions such as Actinic keratosis besides Basal Cell Carcinoma, Squamous Cell Carcinoma and Malignant Melanoma which are serious cancers.

The Flu or Influenza is a respiratory disease caused by Influenza viruses A and B. The flu outbreak is responsible for over 20,000 deaths and over 170,000 hospitalizations in the United States annually during each epidemic. Five pandemics of influenza have occurred in the last 100 years, the worst of those was the Spanish pandemic in 1918 and 1919 resulting in over 20 million deaths worldwide.