What are the side effects of doxycycline?

My dermatologist prescribed me doxycycline pills to take twice a day about two months ago and I've be wondering what the possible side effects are besides bad stomach aches if taken without food.

There's also an advisory on the bottle to avoid prolonged exposure to sunlight. What could evolve if I'm out in the sun too long while taking these pills?
Answers:
Doxycycline is a powerful antibiotic! I know, I was prescribed it for MRSA.

Cautions and side effects are similar to other members of the tetracycline antibiotic group. However the 10% risk of photosensitivity skin reaction is of particular importance for those intending long-term use for malaria prophylaxis because it can cause enduring sensitive and thin skin. GERD is common with the use of doxycycline.

Unlike some other member of the tetracycline group, it may be used in those with renal impairment.

It should be taken with a full cup of water and patients should be upright for at least 30 minutes after regime to prevent irritation of the esophagus and stomach. Also, there is a slim risk of liver damage during prolonged use of the drug. It is also recommended that it be taken with a small lunchtime of a non-dairy nature if upset stomach, nausea, or fatigue occurs.

Doxycycline is not approved for use in children beneath the age of 8 years for two reasons: 1) it can cause permanent yellowing or graying of the teeth, and 2), according to CDC merciful information on doxycycline, it can inhibit bone growth in premature infants during the time the medication is taken; this last effect disappears when the doxycycline treatment is over.

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