My period is delay i want medicine name to get my...

what is the possible causes of missed periods ?
1. pregnancy ( if you sexually active ) 
2. Hormonal abnormalties 
3. medications side effects such as Medroxyprogesterone acetate
4. stress
5. Obesity
6. Thyroid diseases
7. gastic system disease (wheat allergy)
8. ovarian cysts 
9. malnutrition and low weight 
What to do next ?
- if you have been sexual active recently , do home pregnancy test and if its positive , consult an OBGYN 
- if you havent been sexually active recently , consult an OBGYN doctor first , and treatment options are usually the following : in case of productive hormonal changes , doctor may prescribe medication to correct hormones imbalance such as duphaston , which you should take a pill every 12 hours for 5 days  , on the other hand , in case of thyriod hormone abnormalties ( usually accompanied with other symtpoms ) , doctor will prescribe medication such as Levothyroxine , and in case of other chronic disease such as ovarian cyst or other disease , doctor may need advanced examnation to determine the causes and treatment pathway 
Needed medical examnation :
- clinical examnation  ,productive system ultra sound  , hormone levels including FSH / LH / TSH / PROLACTINE 

what to use in your case ?
in case of unplanned sexual intercourse , its better to take emergency pills to prevent pregnancy 
what are emergency pills ?
its a medications that contain high levels of hormones that cause imbalance the led to prevent pregnancy but prevent implanting the ovums 
emergency pills names and brands ?
1. Contraplan
2. Norlevo
3. EllaOne
- if not possible , you can take normal OCP pills like jasmine or genera pills by the following order : first dose : 4 pills in first 72 hours after the intercourse , second dose 4 pills after the first dose by 12 hours 
* those pills should be taken in the first 72 hours after the sexual intercourse 
What is emergency pills side effects ?
1. stomach pain 
2. vomiting 
3. diarrhea 
4. breast pain
5. dizziness
6. headache