My 7 year old is very active Has ADHD, requires a lot of attention. He says he wants a sibling. Feel like I will loose focus on my son ?

Your fears are reasonable, they are. However, that does not mean you should not have another child based solely on your fears, unless you KNOW you cannot handle having 2 children.

I had a 2nd child when my first was 2 years old, before my 2 year old was diagnosed with ADHD.

I would do it all over again! Medication and all. Meds for him - Not me! LOL We got the help our son needed. We learned behavior modification techniques. We learned to adjust and cope. So can you...if you are willing! 

Ask yourself: is your spouse supportive about your child's condition? That is ULTRA important. Because, what if you have another ADHD child ? if you and hubs are not in TOTAL agreement about how to handle and treat your 7 year old child, another child could breakup the marriage and then you would be raising 2 children on your own.

Get him a very smart dog that will keep his mind and energy focused. Border collies are very active and super smart and trainable. They require to excersice they brain daily as well as stay active. 

Do you want to have another child? If you're only contemplating having another one because your son wants a sibling then I suggest that you don't have another child if you feel swamped already. 

I don't know how old you are or if your clock is ticking but if you can wait, I'd suggest you wait until he's at least 12. At 12 your son will have learned ways to control himself to a degree better than what he can do at age 7, perhaps he will be ADHD meds for school and at home so he will be less hyper and calm to learn life skills, family skills and school skills. 

Either or, I think you should wait.

Well, I don't have ADHD and as an only child, I really wanted a sibling when I was seven (and at other times) but it didn't happen and it never will. But you do what you all want. Why should you let anyone, let alone a 7 year old, make your life choices? Just tell him it simply isn't going to happen and put up with it!

I think you meant to write LOSE not loose, they mean different things, like after you give birth to a baby your tw*t might feel a bit loose

Since when does a 7-year-old dictate you and your husbands choice of having more children? Get a grip. If you and your husband WANT another child and can afford the costs, then feel free.  If you and your husband do not want another child and or do not feel you can handle the needs of your son, then don't.

You do have to understand that another child could also be hyperactive.  Your son is also old enough that your family can be working with a psychiatrist and other professionals to work on possible medication, behavior modification (brain training), and changes in diet that may help your son.  

What does your husband think about this? It's a matter for you and him to decide, not for strangers on the internet.

It doesn't matter if he wants a sibling. He doesn't have to raise the sibling - you do. Do what YOU think is best for YOU.