Good day doc.it is ok if i take medicine even i...

is it ok to take medications during period menstration ?
some medications are allow to be taken during period , some are not , its depends , but usually pain killers and antibiotics are allowed 
why would medications wont be allowed during period ?
because it may cause one of the following :
1. affect period nature 
2. cause more pain 
3. cause more bleeding 
 
What is the nature of period bleeding ? 
nature : usually you bleed around 50 cc per period 
duration : usually its around 4-6 days , but it can last as few as 3 days , and as much as 7 days 
shape : its may look like a flow in first 2 days , then tend to be like spotting after that 
color : bright red , and may be accompanied by blood clots , or vaginal discharge at early or late time of the period