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All SSRI antidepressants can cause both a loss and gain of appetite. Individuals respond differently to Prozac (Fluoxetine). But generally it can takes around four weeks most patients that suffer changes in appetite.

10mg is quite a low dose for adults/ adolescents. Most people at this dose don't get any long term side effects. For the first week they may feel drowsy with persistent yawning

Loosing appetite is very rare at the 10mg level however people with bulimia nervosa can be treated with prozac starting at 60mg daily to stop them from gorging

Fluoxetine may cause side effects. Tell your doctor if any of these symptoms are severe or do not go away:

nervousness

nausea

dry mouth

sore throat

drowsiness

weakness

uncontrollable shaking of a part of the body

loss of appetite

weight loss

changes in sex drive or ability

excessive sweating

Some side effects can be serious. If you experience any of the following symptoms or those listed in the IMPORTANT WARNING section, call your doctor immediately:

rash

hives

fever

joint pain

swelling of the face, throat, tongue, lips, eyes, hands, feet, ankles, or lower legs

difficulty breathing or swallowing

fever, sweating, confusion, fast or irregular heartbeat, and severe muscle stiffness

seeing things or hearing voices that do not exist (hallucinating)

seizures

http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH000088...