Hi Georgiagirl,
This is what I found on the National Institute of Health's website, MedlinePlus;
Low blood pressure is commonly caused by drugs such as:
* Alcohol
* Anti-anxiety medications
* Certain antidepressants
* Diuretics
* Heart medicines, including those used to treat high blood pressure and coronary heart disease
* Medications used for surgery
* Painkillers
Other causes of low blood pressure include:
* Advanced diabetesdiabetes
* AnaphylaxisAnaphylaxis (a life-threatening allergic response)
* Changes in heart rhythm (arrhythmiasarrhythmias)
* DehydrationDehydration
* FaintingFainting
* Heart attackHeart attack
* Heart failureHeart failure
* ShockShock (from severe infection, stroke, anaphylaxis, major trauma, or heart attack)
And, so that you can check it out on your own;
www.nlm.nih.gov/medlineplus/ency/article/007278.htmHope this helps some!!