Ask a doctor

How Many Botox Units for 11's or Frown Lines?

I received 20 units of Botox yesterday. Now I think I may have been cheated, he just wanted to get his $256 and the 20 units he injected were not nearly enough to get "rid" of the moderate/severe "11's" on my forehead. What is the average amount of units needed for this?

Doctor Answers 113

Botox today gone tomorrow.


You seem to have a real distrust for your injecting physician. There is no reason for a practitioner to "cheat" you. The effects of Botox are temporary, lasting only 3 or 4 months, so you will undoubtedly need future treatments. Your injector certainly wants you to be a satisfied customer, to keep you coming back for more treatments. Don't be so skeptical, trust your physician, especially if he/she is a board certified plastic surgeon. Twenty units is a perfectly reasonable amount for your frown line area and may take up to a week to take effect.

Botox takes several days to start working

I can understand your frustration. However, you state that you just had the Botox yesterday. It will take 3 to 7 stays for it to start working and sometimes up to 2 weeks for the final effect. So, please be patient to see the effect.

However, it does usually take between 20 to 30 units for the glabella (your "11's") area. It takes another 15 to 25 units for your forehead and another 2.5 to 5 units for around each eye (crow's feet).

I hope this is helpful.

David Shafer, MD
New York Plastic Surgeon
5.0 out of 5 stars 64 reviews

One day after injection is not enough time to see Botox results.

If you just received your Botox injection yesterday, you would not expect to see any results yet as it has only been one day since your treatment. To see the effects of the Botox it takes on average 3-5 days from the injection day. The complete results are usually noted at about 7 days.

The average amount of Botox used for the “11” lines between the eyebrows is around 20-25 units for a female. Males will usually require more units as their facial muscles are often thicker and stronger. Ultimately the number of units you need depends on the size and strength of your corrugator muscles.

We tell our patients to call us between 10-14 days if there is any question as to their results. We will then bring them back in for after pictures to compare the results and perform a touch-up procedure if necessary.

Dan Mills, MD
Orange County Plastic Surgeon
4.5 out of 5 stars 22 reviews

Botox 25 to 30 Units is Best Frown Line or 11's Treatment

Wait two weeks to evaluate your Botox result. If after two weeks yiou see nothing go back and see your doctor. It takes at least 4 days to see a result after Botox treatment.

I have had many patients respond well to 15-20 Units of Botox. However in patients with thicker skin and large muscle and in patients who have had Botox before I now use 25-30 Units for best effect.


Botox injection for forhead

It may take up to two weeks to have the full effect of the Botox on your  frown lines. You will most likely see more improvement

If you can still re-create the lines, all it means is that you either needed more units of Botox injected or you did not have it injected in the right location.

I routinely see patients two weeks post injection to determine if a "touch up" is needed and also to learn how I can do it better for that particular patient the next time.

Best wishes,

Dr. Sajjadian

Ali Sajjadian, MD, FACS
Orange County Plastic Surgeon
5.0 out of 5 stars 176 reviews

It takes 2 weeks to see the maximum benefit from Botox.

I assume you are talking about the vertical lines between your eyebrows. We call this the glabella.

I personally use 25 units for women in this area and more for men. But many doctors use 20 units, so this is perfectly proper. Of course, exactly where along the muscles the Botox is injected makes a big difference.

You will probably be quite happy in a few days.

George J. Beraka, MD (retired)
Manhattan Plastic Surgeon
5.0 out of 5 stars 9 reviews

Too early to judge results

I also use 20 units as a standard treatment for glabellar frown lines ("11's").  It usually takes 3-4 days to see any effect, and 7-10 days to reach maximum.  If, at the end of that time, you have not achieved the results you desire, it may be that your creases are so deep and have been there so long, you may need a small amount of filler (e.g. Juvederm) to finish the job.  It is not uncommon to have to use the two products together.

Cheated on the Botox?

  I agree that the average femail requires at least 25 units to treat the vertical forehead lines.  But some require more than this.  Chances are that you were not short changed by your doctor.

Lawrence Kass, MD
Saint Petersburg Oculoplastic Surgeon
5.0 out of 5 stars 84 reviews

Botox dosing for "11"s

The usual starting dose for the lines between the eyebrows in an average woman is 20 units. I like to use that dose and have my patient return in 2 weeks to assess and add additional Botox if needed. Then I know the exact dose appropriate to that patient and in the future she will not need a touch up visit. Another thing to consider is that if after 2 weeks the movement is gone but the wrinkle is still there you may need a little filler.

Susan Van Dyke, MD
Paradise Valley Dermatologic Surgeon
4.5 out of 5 stars 18 reviews

Yesterday? Botox doesn't work that fast!

Botox takes several days to start to kick in and the maximal results are seen in 7-10 days. If you got it yesterday it is waay to early to judge if it is too much or too little. Any effect you see today is probably largely placebo effect.

Chris Thiagarajah, MD
Denver Oculoplastic Surgeon
5.0 out of 5 stars 7 reviews

These answers are for educational purposes and should not be relied upon as a substitute for medical advice you may receive from your physician. If you have a medical emergency, please call 911. These answers do not constitute or initiate a patient/doctor relationship.