Drowsiness after taking progesterone capsules may be a side effect caused by the drug, but also due to lack of sleep, early pregnancy reaction and other reasons. 1. drug side effects: progesterone capsules belong to the progesterone class of drugs, after taking may produce side effects, such as nausea, vomiting, drowsiness, fatigue, there will be sleepy performance, generally stop using the drug after the symptoms will disappear. 2. Sleep deprivation: eating progesterone capsules will be sleepy, not necessarily caused by the side effects of the drug, the poor quality of sleep at night, sleep deprivation will also be sleepy performance. 3. Early pregnancy reaction: due to hormonal changes in the body, early pregnancy will appear weakness, sleepiness and other common phenomena, generally 12 weeks will be relieved or disappear. Therefore, after taking progesterone capsules may appear sleepy symptoms, if the drug does not disappear or even aggravated, we should consider other causes. It is recommended to take progesterone capsules under the guidance of a doctor, do not blindly use their own medication.