If Medication Causes Hair Loss, How Soon Will I Know?

How long after taking the first dose of a medication would your hair start falling out if the medication is actually the cause? I have taken 4 doses of Oxycodone 5mg and noticed an increase of hair loss. Can this small amount of a medication have an impact on hair loss? If the medication is the cause, how long after discontiuing the medication should the hair loss subside? I thought hair loss was based on the hair growth phases and that nothing would effect your hair immediately, that if you took a medication that effected your hair it would show up weeks later not right away. Thanks

I doubt that 4 doses of oxycodone would cause hair loss. The drugs that do cause hair loss are often insidious in the timing (up to a few years). When a medication does cause hair loss there is no guarantee that just stopping the drug will solve the problem.