Allergic Reaction?

I have been taking Phentermine 37.5 mg for the last two weeks. I also noticed  a skin rash on my stomach near my navel. I also notated in my journal, about two months ago, a skin rash. At that time, I was on Phentermine as well. Is this a side effect of the medicine or an indication of too much caffeine?

[Paderla Anitha, DNB]

Hello and hope you are doing well.

Phentermine is known to cause urticaria in sensitive people. It could be an allergic reaction to the medication. The most common signs of a drug allergy are hives, rash, facial swelling or fever. If you have an allergic reaction to a drug, it causes the release of histamine and other chemicals that cause allergic symptoms. Your immune system then becomes keyed to react the same way if you take the drug again in the future. However, the immune system changes over time, and eventually it's possible your drug allergy may go away on its own.

So, avoid taking the medication, if you develop similar symptoms repeatedly. Consult your doctor for alternate medications.

Hope this helped and do keep us posted.