What is the recommended action for a patient who has been on oral doxycycline for 2 weeks without improvement in moderate acne?

Continuing with the current therapy for an additional 6-8 weeks is the recommended action for a patient who has been on oral doxycycline for 2 weeks without seeing any improvement in moderate acne. This is because many patients do not show noticeable results until they have completed a longer course of treatment with antibiotics like doxycycline. It typically takes about this duration for the effects to manifest, as acne treatment often requires time for the medication to exert its full therapeutic effect on the skin.

Increasing the dose of doxycycline isn't usually warranted at this stage, as it's more beneficial to allow enough time for the current dose to work. Switching to minocycline or initiating treatment with oral isotretinoin would be more drastic measures, generally reserved for cases where there is severe acne or lack of response after an appropriate duration of treatment with the first line of therapy. In moderate acne cases, patience with the current treatment plan is key, hence the recommendation to continue doxycycline for a longer period before making any changes.