Theo-24 Cr is a sustained-release formulation of theophylline used to treat chronic respiratory conditions. It is classified as a bronchodilator that improves airflow in patients with asthma and chronic obstructive pulmonary disease. The drug works by inhibiting phosphodiesterase enzymes, leading to an accumulation of cyclic adenosine monophosphate in airway smooth muscle. This rise in cyclic adenosine monophosphate produces relaxation of bronchial smooth muscle and reduces inflammatory responses. Additionally theophylline blocks adenosine receptors, further contributing to bronchodilation and improved respiratory function. The controlled-release design delivers a steady concentration over 24 hours, maintaining therapeutic effects without frequent dosing.

Theo-24 Cr is an extended-release formulation of theophylline used to manage chronic respiratory conditions. It belongs to the class of methylxanthine bronchodilators that improve airflow by relaxing airway smooth muscle. The medication delivers the drug slowly over 24 hours providing sustained plasma concentrations that reduce the frequency of dosing. By inhibiting phosphodiesterase enzymes theophylline increases intracellular cyclic adenosine monophosphate leading to smooth muscle relaxation. It also blocks adenosine receptors which further contributes to airway dilation and reduces the response to inflammatory mediators. The extended-release design helps maintain a steady therapeutic effect while minimizing peaks that could cause side effects. Pharmacodynamically this action translates into improved ventilation and reduced symptoms such as wheezing and shortness of breath. Overall the drug works by modulating biochemical pathways that regulate bronchiolar tone and inflammatory signaling.

Theo-24 Cr may cause nausea as a common side effect. Some people experience vomiting or stomach discomfort. Headache is frequently reported among users. Insomnia and restlessness can occur due to stimulant effects. An irregular or rapid heartbeat is also a typical reaction. Tremors and mild nervousness are observed in many individuals.

Theo-24 Cr may cause nausea in some individuals. Headache is another frequently reported side effect. Insomnia and restlessness can occur due to its stimulant properties. Tremors or shakiness of the hands are observed in certain patients. An increased heart rate may be noted during treatment. Gastrointestinal disturbances such as stomach upset are possible. Some users experience irritability or nervousness. These reactions are generally mild and vary among individuals.