Thanks for your query.Phentermine
is not known to affect periods (as per the literature of the manufacturing company.
It is common for ladies to have an occasional delayed period, once in a blue moon. Chances of pregnancy
You have neither mentioned your age, nor the reason for taking phentermine (which is used to reduce body weight). In case, you are overweight
, please exclude hypothyroidism
, which can cause irregular periods
As this is the first time of a delay in period, you need not be concerned about it. However, you should see your gynecologist if the next 2-3 periods become irregular.
Dr. Rakesh Karanwal