Thank you for your enquiry. As a general rule of thumb, herbs are medications too, so I do not advocate self medicate.
If it's a concerning issue, I would recommend that you see a registered TCM practitioner for an assessment.
The reason being low blood pressure may just be an presentation of an internal imbalance which a TCM practitioner seeks to find out, or he/she may need to rule out other medical conditions too.
When the cause is determined, then will a TCM practitioner be able to formulate a treatment plan specially for you, which commonly consist of herbal prescription and/or acupuncture.
That being said, people with low blood pressure are often found to be deficient in Qi and/or Blood. Thus, a practitioner may prescribe qi-nourishing herbs such as codonopsis, astragalus or blood-rejuvenating herbs such as chinese angelica root. Alternatively, invigorating acupoints such as Bai Hui (百会穴), Zu San Li (足三里) may be selected during acupuncture.
I hope it helps!
With regards,
Physican Lee