Phenazine

No, the Phenazine is not safe to be used in babies who are younger than 2 years. This is because the [medicine] may cause respiratory depression in young infants. As a parent, one must avoid to self-medicate them. It is best to speak to their pediatrician regarding the use of Phenazine.

Yes, Phenazine comes in combination with codeine. The combination is used to relieve the runny or stuffy nose, sneezing and other symptoms caused by an allergy or a common cold. Phenazine acts as an antihistamine agent by working against histamine released by the body. Histamine is responsible for symptoms like itching, watery eyes, runny nose, etc. Codeine, on the other hand, is a narcotic. It acts as a pain relieving agent by working on the central nervous system. 

Phenazine is usually not prescribed with metronidazole, however, in some cases, these medicines may be prescribed together and then your doctor may change the dose and dosing schedule of one or both of the medicines.

Citalopram is an antidepressant which interacts with Phenazine causing increased serotonin levels in the blood. This can cause adverse cardiac effects like high blood pressure, an increase in the heart rate and this might lead to shock. 

Most antipsychotics cause weight gain and Phenazine is also one of the drugs that cause the same. Phenazine induces sleep and causes lethargy in patients due to which the physical activity gets reduced, leading to weight gain. Since weight loss is difficult for most people, emphasis should be paid on preventing weight gain using lifestyle modifications comprising a change of diet and the addition of physical activity in routine.