Which of the following treatments is least likely to provide relief for primary dysmenorrhea?

Primary dysmenorrhea is characterized by painful menstrual cramps without an underlying pelvic pathology. The initial management often includes non-pharmacological and pharmacological treatments.

Nonsteroidal anti-inflammatory drugs (NSAIDs) are commonly used as they effectively reduce menstrual pain by inhibiting prostaglandin synthesis. Regular warmth application, such as heating pads or warm baths, can also be beneficial as it helps to relax the uterine muscles and may alleviate pain. Acupuncture has been studied and may provide relief for some individuals by promoting relaxation and altering pain perception, though responses can vary widely.

Low-dose progestin therapy, while it can be beneficial for other menstrual disorders or conditions involving hormonal imbalances (like endometriosis or heavy menstrual bleeding), is not typically a first-line treatment for primary dysmenorrhea. Its role is more complex and it may not directly address the acute pain caused by dysmenorrhea. Therefore, compared to the other options, low-dose progestin therapy is least likely to provide quick relief for the symptoms of primary dysmenorrhea.