Phlebitis is caused by being obese or overweight

Condition analysis:
You're ok...phlebitis is just inflammation of a vein. You are not at risk for a blood clot at all unless you were diagnosed with thrombophlebitis. (thrombo = blood clot, it's the T in DVT).

If you feel you are at higher risk anyhow (and hey, better safe than sorry), then get some good support hose, AND get up and walk every opportunity you have.

EDIT- Ok given your further information that you have thrombophlebitis I recommend that you speak with your GP about it. He will probably give you the same advice as I did, except provide you with some hospital grade support hose and he may want to prescribe you with something.

Most important here is that you are not sitting there for long periods unable to walk around. But yeah, please check with your doctor before this trip...the anti-inflamatories and antibiotics will do nothing for DVT. You really don't want to mess around with this as it can cause a pulmonary embolism.

Instructions:
Lose Weight: Sometimes phlebitis is caused by being obese or overweight. Do your best to lower your weight to a healthier level. Try easier exercises, like going for walks, first and then step it up. Joining a gym or other type of exercise group is one of the best natural home remedies to lose weight and to get support at the same time. Exercise, along with having a balanced diet, is a great combination for losing weight safely.