Uniphyl Cr is a sustained-release formulation of the bronchodilator theophylline. It is prescribed to improve respiratory function in patients with chronic obstructive pulmonary disease or asthma. The drug acts by inhibiting phosphodiesterase enzymes which leads to increased intracellular cyclic adenosine monophosphate levels. Elevated cyclic adenosine monophosphate causes relaxation of bronchial smooth muscle and facilitates airway dilation. The sustained-release design maintains therapeutic concentrations over an extended dosing interval. This prolonged exposure enhances the medication's ability to keep airways open and reduces exacerbation frequency.

Uniphyl Cr is a brand formulation of theophylline used in the management of respiratory conditions. It belongs to the class of methylxanthine bronchodilators that enhance airway smooth muscle relaxation. The medication works by inhibiting phosphodiesterase enzymes which leads to an increase in intracellular cyclic amp levels. Elevated cyclic amp reduces bronchoconstriction by modulating intracellular calcium signaling and promoting mitochondrial relaxation. Additionally theophylline antagonizes adenosine receptors which contributes to its anti-inflammatory effects in the lung tissue. This dual mechanism provides bronchodilation and improves respiratory muscle strength for patients with chronic obstructive pulmonary disease. The sustained release properties of Uniphyl Cr allow for prolonged therapeutic levels that support continuous symptom control.

Uniphyl Cr may cause nausea and vomiting in some patients. Headache and insomnia are frequently reported side effects. Tremors and restlessness can occur due to stimulation of the central nervous system. An increased heart rate and palpitations are common cardiovascular reactions. Some users experience heartburn or stomach discomfort. Irritability and nervousness are also noted psychological responses. Elevated blood levels of theophylline may lead to tremor and agitation in susceptible individuals. These effects are generally mild and tend to diminish with continued use.

Uniphyl Cr may cause nausea or stomach upset in some individuals. It can lead to headaches or dizziness as a common side effect. Some users experience trouble sleeping or vivid dreams due to its stimulating properties. Tremors or shaking hands have been reported with higher doses. Increased heart rate and palpitations may occur, especially if the medication is taken too quickly. Frequent urination and mild dehydration are also observed in certain patients. In rare cases, seizures can develop when blood levels become too high.