Possible, but probably require a higher dose
Of the thousands of Botox patients that I have injected, I have never encountered a patient with immunity to the effects. There have been patients that require higher dosages, sometimes twice the usual amount.
The most popular Botulinium Toxin type A in use, and the one that you probably received from your 5 injectors is Botox manufactured by Allergan. You may consider using Dysport which will soon be marketed by Medicis as Reloxin. Mentor will be putting out another alternative called PurTox. There are two other forms Xeomin in Germany, and Prosigne in China.
If you have superficial lines in your glabella, a fractionated CO2 laser resurfacing is a great alternative, and a more permanent "fix". At age 53, you (like me) are showing other signs of aging like lax skin under the eyes, face and neck, hooding of the upper eyelids, crow's feet, and general sun damage of the skin. A single treatment with Fraxel re:pair, Active/Deep FX, or Mixto will give you overall skin rejuvenation, help you look years younger, rested, and healthy. If you choose to go with the fractionated CO2 laser, make sure to choose your treating physician most carefully. Be well.
Botox immunity, a growing problem
Patients who receive dilute Botox at clinics, then come in frequently for touch-ups when the weak Botox fails can, I believe, essentially develop immunity to Botox. It is actually a growing problem.
Fortunately, if all the Botox is allowed to go away for a period of 6 months, and the patient goes to a reputable doctor who uses concentrated Botox, applied to the right muscles, most patients can return to a normal Botox injection cycle every 3 or 4 months.
There are rare situations where a person's body may not react to Botox as expected, and you appear to be one. As an alternative, you might want to try a filler for the number 11 lines such as Restylane or Juvaderm. Without actually examining you, it's difficult to say what might be best. Also a surgical procedure could be performed to intentionally cut some of the muscles that create the #11 lines. I hope this helps. I am sorry that it did not seem to work well for you.
It is possible to develop resistance to Botox,usually through your body making antibodies to the Botox. The number of units injected may account for decreased response. However, if you have developed a resistance, then Dysport or Xeomin may still work.
Dysport, Xeomin and Botox are all preparations of botulinum toxin A which is a derived protein that works at the nerve-muscle interface to relax targeted muscles. Dysport and Xeomin have been around in Europe for a long time and more recently introduced in the USA. Note the dosage is not the same between the drugs though each works well in my experience.
Why not try a different type of muscle inhibitor, such as Dysport? If that doesn't work, then you an consider a different treatment such as fillers.
In some rare cases, patients may not react or no longer react to botox. Dermal fillers are a safe alternative in the hands of an experienced injector on the appropriate patient.
Botox does not immediately erase lines, but it does over time!
You say that you had Botox injected by five different doctors on five different occasions. This makes me wonder if you had all of your five treatments in a row, every three months, or whether you tried every 6 to 12 months.
I ask this because you said you have fine lines between your eyebrows (frown lines) which aren't deep. But it is very possible that the Botox DID work..... to prevent you from frowning and folding the lines, but that the Botox wasn't in place long enough in a row to allow the lines to totally flatten over time.
If lines are deep enough, Botox does NOT erase them. It only prevents the underlying muscles from repeatedly folding the skin... and as the skin stays flat over months (and months)... the lines may smooth out. I am not totally surprised that you could still see visible fine lines after each Botox treatment.
If you want to try again, remember how the Botox works, and ask your board-certified dermatologist or plastic surgeon if a small amount of filler under the lines would help you with more immediate line erasure, while the Botox sits in place to prevent re-deepening. Good luck!
Rare, but not unreasonable....however, from the wording of your question, the botulinum toxin you received never worked for you. I have had a few patients with the same issue....Recently I have treated these patients with a higher concentration of the medication and therefore a smaller volume which allows less migration of the drug and therefore has been more effective. I also think this limits the amount of effective drug needed and lowers the risk of immunity in the future...only theoretical though.
There is also recent information, and I am awaiting scientific data, to show that vitamin supplements (Zinc) may increase the effectiveness of Botox injections. We'll see....
Hope this helps!
Immune to Botox / Botox Resistance
There is about at 1 in 10,000 chance of developing antibodies to Botox. I have seen two patients in my practice with this problem. If you are concerned, your blood can be tested for the antibodies. Also, there are other botulinum toxins, such as Myobloc, which can be used effectively in patients with immunity. Good luck.
I've had a couple of patients develop immunity to Botox over the years. They both responded very well to Dysport, which is a different type of botulinum toxin. I would only used Dysport, however, on one of my own Botox patients. There are a lot of injectors out there who do not inject deeply enough (especially between the brows where the muscles are deep) or who really dilute their Botox. For patients who have not had good luck with Botox from another injector, I will give Botox another try and it usually works.