I am blood donation 1st time finish second time...

Dear Customer
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What is the duation you should wait between blood donation ?
- first one and second one : 56 days 
- second one and third one : 112 days 
How many times it recommanded to donate blood ?
its depends on your medical condition , but usually if your hb is high , its recommanded to donate every 6 months 
What are the possible side effects of donating ?
1. low blood volume ( soon symptoms such as dizziness - relieved quickly ) 
2. arm pain  numbness or tingling
3. if you are already have some hematologic problems . donating blood may be harmful for you 
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Kind Regards