Tums, which contains calcium carbonate, can potentially interfere with the absorption of certain medications, including Lipitor (atorvastatin). Calcium can bind to atorvastatin in the gastrointestinal tract, reducing its absorption and effectiveness. It is generally recommended to take atorvastatin at least 2 hours before or 4 hours after taking calcium supplements like Tums to avoid this interaction [3]. This precaution is important to ensure that Lipitor is absorbed properly and can effectively lower cholesterol levels. Lipitor is a statin medication used to reduce cholesterol levels and decrease the risk of heart-related conditions [1]. Interactions between medications like Lipitor and supplements like Tums can impact the efficacy of the medication, so it is advisable to consult with a healthcare provider or pharmacist before combining these two substances [2].

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.verywellhealth.com/statin-side-effects-and-drug-interactions-698202
[3] https://www.drugs.com/drug-interactions/atorvastatin-with-tums-regular-strength-276-0-464-3778.html