(AU, EU, RU: Qlaira, US: Natazia, Bayer)

Progestogen-only pills
Progestogen-only pills (POPs) use a progestogen alone with doses taken continuously and no or a short gap between packs taken. People who use them may experience irregular light bleeds, and whilst irregular in the first few months of taking, usually settles to a regular pattern in time.
Phlebitis can also result from certain medications and drugs that irritate the veins, such as desomorphine.Superficial phlebitis often presents as an early sign in thromboangiitis obliterans (Buergers disease), a vasculitis that affects small and medium-sized arteries and veins in distal extremities often associated with cigarette smoking. Management
Treatment usually consists of NSAIDs, such as ibuprofen and local compression (e.g., by compression stockings or a compress). If the phlebitis is associated with local bacterial infection, antibiotics may be used.For acute infusion superficial thrombophlebitis, not enough evidence exists as of 2015 to determine treatment. See also
Collapsed vein

References
Further reading
Intravenous Infusion Therapy for Nurses (Second Edition) by Dianne L. Josephson (ISBN 1-4018-0935-9)
John Hunter, "Observations on the Inflammation of the Internal Coats of Veins," Transactions of a Society for the Improvement of Medical and Chirurgical Knowledge, vol. 1 (London:  1793) pp. 18–29

External links
eMedicine Health: Phlebitis