One who is only slightly ill:
Having a gentile do a Rabbinical prohibition: If one is not in tremendous pain and does not have a sickness which incorporates his entire body but rather [only] a minor illness, then it is permitted for him to do all Rabbinical prohibitions through a gentile even without [having the gentile do so with] an irregularity as was explained in chapter 307 [Halacha 12]. [Regarding giving assistance to a gentile which is giving the medical treatment-See Halacha 8]
Having a Jew do a forbidden action: However [one may] not [do any forbidden action, even Rabbinical] through a Jew even when done with an irregularity.
Medication: Based on the above [on the one hand] it is permitted to apply an external medical treatment through a gentile which places [the medicine] on him, since he [the Jew] is not doing any action in having this done. (However [on the other hand] it is forbidden for [the sick person] to eat foods that are recognizable that they are eaten as medication as will be explained). [As well any and all forms of recognizable medical treatment are forbidden to be applied by a Jew, as will be explained in Halacha 7 See There!]
Summary-One who is only slightly ill:
Having a gentile do the treatment: All Rabbinical prohibitions may be done. The gentile may do so regularly.
Having a Jew do the treatment: A Jew may not do any prohibition, even Rabbinical and even with an irregularity. Thus even an action which involves no prohibition but is recognizable that it is being done for healing may not be done.
Taking medicine: Is forbidden.