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Washout Period

Every clinic has a washout period during which you are not allowed to do a study at the same clinic or any other clinic. 

The minimum period is 30 days since last dose, however some washouts go based on last study procedure (such as out patient visits).

The washout period may vary from study to study depending on the half-life of the drug.

Certain studies like radio-labeled drugs will have a 1 year washout before you can do another radio-labeled drug. 

In addition to the clinic's washout policy, the sponsor may impose a longer washout period.

Some studies will have a longer washout before you can sign up.

 

In general, you can sign up and screen for another study during the washout period as long as the check in date is at least 30 days after your last dose in the previous study.  However, depending on how fast your body recovers from a study, you may want to wait the full period to avoid problems with screening. 

 

People who screen too soon after a study typically have lower red blood cell, hemoglobin, hematocrit and iron.  If these levels are too low, you could get banned from participating in studies because having low levels is unhealthy and unsafe for participating in a study. 

   
Replenishing

After completing a study with many blood collections, you may want to take some iron supplements to help rebuild your blood count.

I recommend natural vitamins found in foods like mussels, oysters, fish, beans, leafy greens, flax seed and other foods high in iron content. 

Supplements can take longer to absorb than natural vitamins found in foods. 

You should also intake a consistent amount of water.  I recommend the daily allowance of 2 to 2 and a half liters a day.  This should be spread throughout the day.  It is important to keep hydrated at all times.  If you feel thirsty, then you are already dehydrated. 

   
Sexual Activity: When you take an investigational drug, the effects on pregnancies are unknown.  Therefore, females should not become pregnant while participating in a clinical research study or for 90 days after the last dose.  The same rules apply to males.  Males should not get anyone pregnant during a research study or for 90 days after last dose.  This is usually outlined in the Informed Consent.  If you or your partner becomes pregnant during he study or 90 day period, the study doctor may want to monitor your progress.  This will be outlined in the informed consent. 
 
 

 

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