These instructions are from sbherbalremedies.com. If your tincture is similar, you could follow the same instructions.

from:
http://sbherbalremedies.com/dosage.asp

Take 10 drops (NOT "dropper full") 3 times daily, diluted in water!

Important!

When you start treatment, you can start with 3 drops 3 - 5 times daily, and then gradually increase.
You can increase up to 10 drops, or you can also continue increasing up to 20 drops.

So, you can use it this way:

day 1: 3 drops 3 times daily.
day 2: 4 drops 3 times daily.
day 3: 6 drops 3 times daily.
day 4: 8 drops 3 times daily.
day 5: 10 drops 3 times daily.

Next 9 days you can continue with 10 drops 3 times daily, or if you have no adverse reactions, you can continue increasing the dosage:

day 6: 12 drops 3 times daily.
day 7: 13 drops 3 times daily.
day 8: 14 drops 3 times daily.
day 9: 15 drops 3 times daily.
day10: 16 drops 3 times daily.
day11: 17 drops 3 times daily.
day12: 18 drops 3 times daily.
day13: 19 drops 3 times daily.
day14: 20 drops 3 times daily.

Take a 7 days break after day 14, and then repeat the same treatment again.

Using plan would be:

2 weeks + 1 week break + 2 weeks + 1 week break + 2 weeks + 1 week break + 2 weeks = total 11 weeks ( while using it actively for 8 weeks )

Dosage for Kids and Pets

Children vary dramatically in size and shape. One 5 year old can be very different from another. The most effective and safest way to dose children is by weight.
Simply make a fraction and put the child's weight over 150 pounds. Look at the following examples and I am sure they will clarify what I am saying.

10/150 = 1/15
15/150 = 1/10
30/150 = 1/5
50/150 = 1/3
60/150 = 2/5
100/150 = 2/3

If a child's weight is 30 pounds, child needs to take 1/5 of the adult dosage.
If a child's weight is 50 pounds, child needs to take 1/3 of the adult dosage.

You can use this same formula to dose animals.

A small dog or cat of 10 pounds would be 1/15 the adult dose

Additional notes for Children

By mixing most herbal tonics 1/2 and 1/2 with pure maple syrup, you can get it down any kid. Call it candy if you need too. By diluting it 50% just take this into consideration and give the child twice as much as the children's dosage you already figured out.
Children are very smart! You must convince the child that the herbal tonic taste good and if you have a scary look on your face they will know your are lying. Making herbal popsicles or having a tea party is far better than strapping them down with a funnel. Love, hugs and kisses can go a long way too.

Additional notes for Horses
Horses are extremely sensitive to Black-Walnut ! Avoid giving Clarkia to Horses!

http://sbherbalremedies.com/dosage.asp